Automatic circuit breakers for motor protection

Art. 140MT

Bulletin 140MT motor protection devices offer enhanced performance, allowing the use of assembled starters without additional branch circuit protection. Branch circuit ratings allow the use of smaller diameter wires in group motor installations, saving money. For three-component starters, motor protection devices with a separate overload relay are used.

Extends the current range (C up to 32A and D up to 40A)
Improves thermal performance by reducing heat loss
Suitable for a wider range of applications due to higher short-circuit ratings
Allows the use of smaller diameter wires in group motor installations, reducing installation costs
Provides simple documentation with the SCCR tool, certifying combination testing with 100-E, 100-C, and 100-K contactors

140MG Motor Protection Circuit Breakers

Art. 140MG

Bulletin 140MG motor protection circuit breakers offer disconnection for the motor branch circuit, magnetic branch and short-circuit protection, thermal overload protection, and manual override. We offer units rated from 25 to 150A to meet your specific needs. Our factory-installed internal accessories simplify installation and wiring.

Enables visible trip indication
Offers high current limiting option
Provides high switching capacity
Available in sizes H and J

140MP Motor Protection Circuit Breakers

Art. 140MP

Bulletin 140MP motor protection circuit breakers provide protection against magnetic short-circuits and thermal overloads up to 32A with a rated tripping device at 400V up to 100kA. They are tested in combination with Allen-Bradley Bulletin 100-C and 100-K contactors to create two-component motor starters.

Provides overload protection - tripping class 10A
Provides phase loss sensitivity
Enables the shutdown function
Suitable for three and single phase applications
Offers UL and IEC Group (Type 1 and Type 2) motors
Offers CE, cULus, CCC, KC, EAC certifications
Provides breaking capacity at 400V up to 100kA

Automatic circuit breakers for electric motor protection PKE

Art. PKE

Eaton relies on electronic control units with PKE circuit breakers for electric motor protection. PKE circuit breakers for electric motor protection with electronic overload protection and a wide setting range offer an attractive alternative to bimetallic solutions for currents up to 65 A and complement the PKZ device family.

Features: Wide adjustment ranges, low heat losses, tripping classes above CLASS 10, and precise and stable tripping curves.

Accessories for circuit breakers PKZM0 are suitable for circuit breaker PKE.

The SmartWire-DT interface allows the integration of PKE into an automation system.

Reducing the number of modules due to wider adjustment ranges simplifies product selection and reduces inventory and transportation costs.
Short-circuit tested up to 100 kA (400 V), up to 32 A 50 kA (400 V) up to 65 A
- There is no need for short-circuit calculations and preliminary testing of fuses
Plug-in modules up to 65 A
- Improves ease of maintenance (short conversion time, quick commissioning)
Accessories from PKZM0
- Minimizes design requirements, provides flexibility to use standard components
Inclusion in the SmartWire-DT system
- Increases the level of system reliability by transmitting process-related data

Automatic motor protection switches PKZM01

Art. PKZM01

The PKZM01 circuit breaker for protecting electric motors with currents up to 25A is ideal for small machines and other applications where push-button control is preferred.

Enclosures with IP40, IP55, and IP65 protection ratings, available as surface-mounted or flush-mounted enclosures, provide protection against direct contact and ingress of solid foreign objects and water. Whether equipped with protective membranes, locking devices, or a dedicated emergency stop button, circuit breakers ensure reliable shutdown.

Design and logistics are simplified by the use of accessories such as voltage releases, auxiliary contacts with trip indication, and auxiliary contacts from the PKZM0 range. The short-circuit breaking capacity is 50 kA.

All installation ranges are short-circuit tested up to 50 kA (400 V)
- Common and full-featured accessories for all sizes are suitable from PKZM0 circuit breakers, which contributes to savings in logistics and design
Accessories (auxiliary contacts and independent tripping devices) are installed without the use of tools
- Reduces the time required for installation
High level of protection against direct contact and penetration of foreign solid objects and water when using special IP40, IP55 and IP65 surface mounting or mounting enclosures
- Direct mounting of the PKZM01 circuit breaker to the installation
Application as a mains switch and emergency stop switch is possible using surface mounting or mounting enclosures
- High level of flexibility thanks to an extended range of functions.

Automatic circuit breakers for protecting electric motors

Automatic circuit breakers for electric motor protection are reliable equipment that play a key role in ensuring the safety and reliability of electrical systems. They not only protect motors from overloads and short circuits but also provide the ability to disconnect branch circuits, making them indispensable in industrial and commercial installations.

Power Technology Solutions is an official distributor of American and European circuit breaker manufacturers, enabling us to deliver high-quality products to customers quickly while providing a high level of technical and informational support.

Basic functions of circuit breakers

1. Motor branch circuit disconnection. Motor protection circuit breakers provide the means to disconnect branch circuits, allowing a specific portion of the system to be quickly and safely shut down for maintenance or repair.

2. Magnetic parallel circuit protection and short-circuit protection. Built-in magnetic elements detect high short-circuit currents, instantly breaking the circuit and preventing damage to the motor and other system components. This protection is essential for preventing serious accidents and costly repairs.

3. Thermal overload protection. Elements in circuit breakers monitor temperature increases caused by prolonged overloads. When a critical temperature level is reached, the device opens the circuit, protecting the motor from overheating and potential failure.

4. Manual switching. Automatic circuit breakers for electric motor protection feature a manual switching function, allowing the operator to manually turn the device on or off. This is convenient for system control and diagnostics, as well as for preventative maintenance.

Advantages of circuit breakers of American and European brands

Reliable components. The circuit breakers are equipped with internal accessories that simplify installation and connection.
High reliability and durability. The use of high-quality materials and advanced manufacturing technologies guarantees a long service life for our circuit breakers.
Ease of maintenance. The devices are designed to be as simple and convenient as possible for maintenance and inspection.

You can purchase circuit breakers to protect electric motors after consulting with our specialists and selecting the right products for your needs.