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Buy Siemens MPCB From Iran

Siemens Thermal Key:

Siemens MPCB (Motor Protection Circuit Breaker) is a circuit breaker used for the protection and safety of motors. This thermal key has important technical features such as the ability to disconnect power, setting the rated current, thermal sensor, performance temperature setting, etc.

Here is an explanation of the mentioned points:

  1. Ability to Disconnect Power: MPCB provides the ability to disconnect power in case of errors such as overload, short circuit, direct contact establishment, or exceeding the allowable temperature in the motor. This capability prevents damage to the motor and related systems.
  2. Setting the Rated Current: MPCB is equipped with the ability to set the rated current of the motor. This feature allows the user to precisely adjust the motor’s rated current, increasing accuracy and efficiency in motor protection.
  3. Thermal Sensor: Inside the thermal key, there is a thermal sensor that measures the motor’s temperature. If the temperature exceeds the permissible range, the thermal key activates the power disconnect function to protect the motor from serious damage.
  4. Performance Temperature Setting: The user can adjust the performance temperature of the thermal key according to their needs. If the temperature exceeds a set limit, the thermal key activates and protects the motor against relevant hazards.
  5. Fault Detection Capability: Some models of MPCB have fault detection capability and can identify common faults such as overcurrent.

The MPCB (Motor Protection Circuit Breaker) is one of the essential devices in the electrical and electronic industry for motor protection. These keys are used in industrial and commercial electrical systems to prevent damage to motors due to increased current, excessive heat, and other disturbances.

MPCB (Motor Protection Circuit Breaker) Operation:

The Motor Protection Circuit Breaker (MPCB) plays a crucial role in safeguarding motors in electrical systems. The primary functions of an MPCB are as follows:

  1. Current Monitoring: This thermal key is capable of monitoring the electrical current entering the motor through electrical wires.
  2. Temperature Monitoring: The MPCB includes a temperature sensor located in close proximity to the motor. This temperature sensor monitors temperature changes.
  3. Setting Safety Limits: The MPCB has settings that determine safety limits for motor current and temperature. These settings are configured by a technician or engineer.
  4. Comparative Operation: The MPCB compares current and temperature based on the configured settings. If the current or temperature exceeds the defined limits, the key immediately initiates the disconnect operation.
  5. Disconnect Function: In case of exceeding safety limits, the MPCB acts as a catalyst and disconnects the electrical current to the motor. This action prevents damage to the motor and connected electrical devices.
  6. Signaling Capability: Some MPCBs have the capability to provide signals to control and monitoring systems. This feature allows operators and engineers to monitor the status of the motor and thermal key, initiating repair actions if necessary.

The MPCB operates to protect motors against sudden increases in electrical current, temperature rises, and safety hazards. These devices are of great importance in various industries, contributing to the longev

Types of Siemens Thermal Relay Models

Siemens MPCB (Motor Protection Circuit Breaker) series represents one of the most innovative and efficient solutions for protecting electrical circuits in the electronics industry. Serving as a fundamental component of electrical and electronic equipment, this thermal relay is responsible for safeguarding circuits against sudden increases in current and temperature.

Siemens, utilizing advanced technologies and diverse designs, has introduced various MPCB series to the market, catering to the broad needs of different industries. This thermal relay is designed as a comprehensive, durable, and reliable device, contributing to the improvement of performance and safety of electrical systems.

Below, we will explore the features, functions, and applications of different Siemens MPCB series. Additionally, the advantages and applications that this technology provides for various industries will be highlighted.

Siemens 3VU Series Thermal Relay

Siemens 3VU model thermal relay is current-limiting circuit breakers with a compact design, suitable for currents up to 100 amperes. They ensure that in the event of a short-term fault, the circuit breaker will safely disconnect and protect loads and equipment against overloads. These products are suitable for operational switching with minimal switching frequency and for safely isolating equipment from the power source.

Key Features of Siemens 3VU Model Thermal Relay:

  • Rotary operating mechanism
  • Relay function saves space and cost
  • Increased system lifespan
  • Compact modular design
  • Reduced wiring time due to SIGUT termination
  • Installable accessories at a common location for the entire handle, reducing transportation and maintenance costs.

The 3VU13/3VU16 models are suitable for use in motor feed circuits without the use of fuses up to 11 kW/22 kW (with a current of 25 A/63 A), protecting motors against overloads, single-phase conditions, and short-term faults.

Motor Protection

Models 3VU13 and 3VU16 provide motor protection against overloads, short-term faults, and phase loss for three-phase motors with power up to 11 kW and 22 kW, respectively. This disconnect device has a twist-to-release switch for ease of operation and can be equipped with auxiliary contacts, trip-indicating contacts, U/V or shunt releases. High breaking capacity is available up to 100kA in the 3VU13 model up to 6A and in the 3VU16 model up to 25A.

Feed Distributor Protection

The standard version of 3VU13 and 3VU16 comes with adjustable O/L and fixed S/C settings. Its main application is for cutting off and protecting distribution feeders with currents up to 25A and 63A, respectively. Numerous overlapping ranges are available to provide protection closer to various loads.

Transformer Protection

A separate model of 3VU13 can be offered for protection against the primary side of the transformer. This model is available up to 20A. To manage the sudden input current caused by switching the transformer, the S/C release is set to 19 times the rated current, compared to the 12 times the rated current available in the standard model.

Fuse Monitoring

Model 3VU1340-1MS00 is provided for fuse monitoring applications. This device is connected in parallel with fuses. If one of the fuses blows, the rated current will pass through the corresponding phase of this motor protection circuit breaker. This motor protection circuit breaker provides a trip signal to the contactor through its auxiliary contacts, disconnecting the motor. Thus, the motor is protected against single-phase faults.

High-Performance Features

  • Instantaneous trip
  • The 3VU circuit breakers operate based on the principle of current limitation.

Current Limitation Principle

In the event of short-term fault conditions, the motor protection circuit breaker disconnects before the short-term fault current reaches the expected peak. Therefore, for a circuit breaker to be recognized as a current limiter, it must interrupt the short-term fault current in half a cycle or less, as demonstrated below.

 

Siemens 3RV1 Series Thermal Relay

The SIRIUS 3RV series thermal relays discussed here are designed for switching operations and protection within a factory or device.

SIRIUS 3RV2 motor starter protectors are available in various versions, including:

  1. Motor starter protectors, standard version (3RV20):
    • Provides protection against short circuits and overloads.
  2. Motor starter protectors with relay function (3RV21):
    • Protection against short circuits and automatic RESET in case of excessive overload in a single device.
  3. MSP for motor starter combinations (3RV23):
    • Provides only short-circuit protection.
    • Combined with an electronic overload relay with wide adjustment ranges and automatic RESET.
  4. MSP for transformer protection (3RV24):
    • Standard version designed for transformers.
  5. Circuit breakers compliant with UL489 standard (3RV27/3RV28):
    • Includes protection against overloads, short circuits, and transformer protection.

Additionally, motor starter protectors 3RV1 are available in the following versions:

  1. Standard version of motor starter protector (3RV1011):
    • Protection against short circuits and overloads.
  2. Circuit breaker for fuse monitoring (3RV1611-0BD10).
  3. Circuit breakers for transformer protection at a distance (3RV1611-1.G14).

It is emphasized that Siemens AG, its regional offices, and affiliated companies (referred to as “Siemens”) cannot guarantee all features of an overall installation or device not designed by Siemens. Siemens also disclaims any responsibility for the mentioned recommendations or references in the provided descriptions. No new guarantees, warranties, or claims of responsibility should be inferred or derived from Siemens’ general supply conditions.

Siemens 3RV2 Series Thermal Relay

Siemens SIRIUS 3RV2 thermal relays are compact and current-limiting thermal relays optimized for power feed connections. These thermal relays are used for switching and protecting three-phase motors up to 37 kW at 400 VAC and for other loads with a current consumption of up to 80 amperes.

For 3RV1 thermal relays in sizes S3 up to 100 amperes, refer to pages 7/63 and beyond.

The new 3RV2 thermal relays are generally approved based on IEC and UL/CSA standards. According to UL 508/UL 60947-4-1 standards, 3RV2 motor starter protectors in sizes S00 to S2 are approved as:

  • “Manual Motor Controllers”
  • “Manual Motor Controllers” for “Group Installations”
  • “Manual Motor Controllers Suitable for Group Leader Protection”
  • “Combination Motor Controllers with Self-Protected Type (Type E)” Please note that for this approval, 3RV20 motor starter protectors must be equipped with additional supply terminals or phase barriers. For more information, refer to “Accessories” on page 7/38.

For corresponding short-circuit connection values, refer to pages 7/10 to 7/15.

Circuit breakers 3RV27 and 3RV28 are approved as circuit breakers based on UL 489 standards; they are special versions of SIRIUS 3RV2 motor starter protectors.

Siemens 3VS Series Thermal Relay

It is recommended to use the motor protectors and motor starters of 3VS13 and 3VS16 with a current capacity of up to 52 amperes. These devices operate based on current-limiting principles and are designed in compact dimensions. They are used for switching and protecting motors or other loads, featuring instant additional current release mechanisms and time-delayed attack relays. Motor starter protections and contactors can form combinations for fuseless starters.

These motor starter protections 3VS13 and 3VS16 are suitable for use in any type of environment. Motor Starter Protections

  • For motor protection
    • ۳VS13: 0.4~25 amperes
    • ۳VS16: 6~52 amperes The specific curves of these motor starter protections are designed to protect against overloads and short circuits.

Time-delayed release mechanisms with inverse time (“a releases”) are adjustable to set the current range for protected motor classes. Instant short-circuit releases (“n releases”) are fixed for 12 times the set value to ensure fault-free motor starts.

Current limiting in 3VS is performed as follows: In the case of a short circuit, the contacts open via the electrodynamic short-circuit current. Instant additional current releases trip all three combiner bridges through the switching mechanism. A large arc voltage is quickly built in the arc chamber, limiting the short-circuit current. This ensures a faster fault clearing.

Temperature compensation up to 55 degrees Celsius without a need for a reduction in performance up to 55 degrees Celsius.

Safety

  • Free-trip mechanism The combiners have a free-trip mechanism. Even with the toggle held, the trip operation cannot be stopped or blocked. This ensures that, in case of an error, positive opening occurs.
  • Positive ON/OFF display through the toggle switch
  • Compact and space-saving

Current Disconnection in Case of Excessive Heat

The thermal relay MPCB, using a temperature sensor, monitors the motor’s temperature. If the motor temperature exceeds the specified limit, the thermal relay immediately disconnects the electrical current, preventing damage to the motor. This function is crucial as excessive heat can lead to motor failure and serious hazards to the electrical system.

Current Disconnection in Case of Increased Current

In addition to temperature, the MPCB thermal relay also has the capability to detect excessive current. If the current exceeds the specified limit, the thermal relay automatically disconnects the electrical current, protecting the motor from serious hazards. This function is of great importance in controlling and safeguarding motors and electrical systems.

Features of Siemens MPCB Thermal Relay

Siemens MPCB thermal relay from Germany has various features that distinguish it from other thermal relays. Some important features include:

  • Adjustable maximum temperature and current limits
  • Protection against unbalanced voltages
  • Detection of faults such as short circuits and power surges
  • Robust design for harsh industrial conditions
  • Ease of installation and replacement

Applications of Siemens MPCB Thermal Relay

Siemens Motor Protection Circuit Breaker (MPCB) is used in various industries for the protection of motors and electrical devices. These devices act as a key component in electrical and industrial automation systems. The main applications of Siemens MPCB thermal relay include:

  • Motor protection: Protecting electric motors in various industries is one of the primary applications of Siemens MPCB. These relays, by monitoring current and motor temperature, prevent damage to the motors.
  • Temperature control and management: In some cases, the MPCB thermal relay is used to control the temperature of specific electrical devices or equipment. These devices control and monitor temperature with specified temperature settings.
  • Protection against excess load: If the electrical load suddenly increases, the MPCB thermal relay serves as an additional protector, preventing damage to motors and devices.
  • Load management: In industries with variable electrical loads, the MPCB thermal relay is used as a management tool to control loads and prevent sudden increases.
  • General industrial applications: These relays are used in various industries such as oil and gas, mining, metallurgical production, automotive, and various other industries, as part of control and automation systems.
  • Automation management: MPCB thermal relays are also used in industrial automation systems to automatically manage the operation of motors and devices.

In general, Siemens MPCB thermal relay is a versatile and widely used equipment in various electrical and electronic industries for protection, temperature control, and electrical load management.

Advantages and Disadvantages of Using Siemens MPCB Thermal Relay

Advantages:

  • Motor protection: MPCB thermal relay acts as a protective device, disconnecting motor operation when the temperature or current exceeds the maximum limit to prevent motor damage.
  • Adjustable temperature threshold: MPCB thermal relay allows users to set their desired temperature threshold, providing precise management of motor temperatures.
  • Adjustable protective current: These devices usually have adjustable protective current capabilities, enabling users to select the desired current for motor protection.
  • Simplicity and ease of use: MPCB thermal relay is recognized as a relatively simple device with easy usability. Settings and usage are easily manageable.

Disadvantages:

  • Cost compared to simple thermal relays: MPCB thermal relay, being an advanced and multi-purpose device, comes with a higher cost compared to simple thermal relays. This could be an economic consideration in some cases.
  • Need for precise design and settings: For effective use of MPCB thermal relay, precise settings and proper design are required. Incorrect settings may lead to insufficient protection or additional load for the motor.
  • Size and physical space: MPCB thermal relay is larger and bulkier compared to simple thermal relays, requiring more space in the electrical panel.
  • Higher complexity: Since the MPCB thermal relay has multiple capabilities and settings, it may appear complex for users unfamiliar with its features.

It should be noted that the choice between Siemens MPCB thermal relay and simple thermal relays depends on the specific features and requirements of each user and motor.

Buying Guide for Siemens MPCB Thermal Relay

If you decide to purchase Siemens MPCB thermal relay, consider the following points:

  1. Precisely determine the protection requirements and required output for your motor.
  2. Choose the appropriate model and size based on the motor’s current and voltage.
  3. Review the various capabilities and features of the thermal relay.
  4. Ensure compliance with industry standards and regulations related to electricity.
  5. Maintenance and repair of Siemens MPCB thermal relay are essential for optimal performance. In case of any faults or malfunctions, it is advisable to consult experienced technicians and relevant experts.

Siemens MPCB thermal relay is a crucial equipment in the low-voltage electrical and electronic industry and electrical panels. It aids in protecting motors and electrical systems. Given its widespread applications and the importance of protection in electrical systems, Siemens MPCB thermal relay is considered a suitable choice.

For purchasing Siemens equipment, especially Siemens MPCB thermal relay, you can visit Electrosheil or contact our specialists.

Frequently Asked Questions

  1. Is Siemens MPCB thermal relay adjustable?

    Yes, Siemens MPCB thermal relay has the capability to adjust the maximum temperature and current based on user requirements.

  2. Is there a need for re-adjusting Siemens MPCB thermal relay?

    Yes, periodic adjustment and examination of sensors and relays are recommended to maintain optimal performance.

  3. Is Siemens MPCB thermal relay resistant to harsh industrial conditions?

    Yes, Siemens MPCB thermal relay is designed to be resistant to harsh industrial conditions.

  4. Can Siemens MPCB thermal relay be used in industrial automation systems?

    Yes, Siemens MPCB thermal relay is applicable in industrial automation systems.

  5. Is Siemens MPCB thermal relay replaceable?

    Yes, Siemens MPCB thermal relay is easily replaceable.

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