Trip coils for circuit breaker

Trip coils are the release components in circuit breakers used in energy distribution for the switching of high currents. It is their task to interrupt fault currents/voltages so that downstream systems are not damaged. The trip coil triggering solenoid initiates this separation mechanism. In case of fault currents/voltages, the specially optimized trip coils trigger a mechanism that separates the electrical contacts.
While in low voltage applications, the protection of downstream machines or motors is paramount in medium and high voltage applications, it is all about the protection of the energy transmission network.
Electromagnetic trip coils are specially designed linear solenoids which meet the requirements in the field of energy distribution. Based on energy availability, power requirement, installation space, and environmental requirements, the optimum solenoid design is determined.

Direct drives for circuit breakers
Kendrion is also developing direct drives for current interruption in the circuit breakers. The special electromagnets are packed with sheet metal or in a closed steel housing. Depending on the design, the electromagnetic actuators achieve a stroke of 2 to 100 mm and a force of 100 to 40,000 N.

Type	High performance trip coil	LCL- frame solenoid	LCM frame solenoid
Dimensions	23x23 to 35x35 mm (LxW)	18x16 to 70x80mm	15x10 to 30x40mm
Stroke	0,5-20 mm	0,5-30 mm	2-12 mm
Force	5 to 1,000N	0.6 to 600N	0.2 to 54N
Switching time	>1ms	>30ms	>30ms
Design	Integrated spring return	Integrated spring return	Integrated permanent magnet

The high performance solenoids excel by an enormous stroke density and a flexible modular system. They are used wherever large forces, short duty cycles and high efficiency with limited installation space are required.

Among the Kendrion offered high-performance solenoids, the "trip coil" series is optimized for particularly short switching times. With these "fast-switching" solenoids, the power density is increased, the magnetic circuit is shortened and the armature diameter is reduced. Thus, switching times under load of up to 1 millisecond with an armature stroke of 3.5 mm are achieved (approx.1.2 m / s). The power input is 1200W, which is why they are used in extreme short-time operation.

The high-performance trip coil is a solenoid in a closed steel housing. The square magnet is very robust and protected against external influences.

✓ high power input

✓ modular design

✓ high forces (5 - 1,000N)

✓ Fast switching time > 1 ms

Frame Solenoids are universal and cost-efficient actuating solenoids and therefore ideally suited for use in precision mechanical and industrial applications. These solenoids are used in the transportation industry as well as in automation and conveyor technology. They excel by individual mounting options, their maintenance-free armature bearing and by their compact design.

The cost-optimized trip coil version is the frame solenoid. The ratio of copper to iron has been designed optimally.

✓ compact design

✓ push and pull operation

✓ maintenance free use

AC linear solenoids allow for extremely fast switching times and very high attraction forces. They are used in machine-building in general and for a wide range of other applications, including switchgear construction.

The trip coil in the latching design fixes the end position of the solenoid. This design is often used when a spring is tensioned with the help of the solenoid. The end position (for tensioning the external spring) is held by permanent magnetic forces.

✓ holding in power-off modus

✓ energy-saving

✓ weight reduction