Trip coils and direct drives for circuit breakers
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.
Technical Data
Info: monostable and bistable latching design possible
| 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 |
High Performance Linear Solenoids
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 solenoid
Convincing reliable
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
Bistable solenoid
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
