Shunt trip for LS Electric TD-TS 100/800 series MCCBs, 220-240VAC/250VDC SHT AC230V/DC250V

Key element of surge protection

The SHT AC230V/DC250V surge trip unit provides an immediate response to dangerous voltage surges in electrical installations. The device has been specifically designed for LS Electric TD and TS series molded case circuit breakers, supporting rated currents from 100A to 800A.

Operating principle and functionality

The tripping mechanism reacts to the exceeding of specified voltage values in the circuit, automatically causing the circuit breaker mechanism to open. The sensitivity range is 0.7-1.1 × Un, allowing for precise adjustment of the operating threshold to the specifics of a particular installation. The trip coil automatically resets after each use, returning to its initial position without the need for manual intervention.

Technical parameters and compatibility

The device operates with a control voltage of 230-250V in both AC and DC circuits, maintaining full functionality at frequencies of 45-65 Hz for the AC version. The maximum disconnection time is only 50 milliseconds, guaranteeing a lightning-fast response to threats.

Safety and resistance

The design ensures high surge resistance thanks to a rated impulse voltage of 8kV and an insulation voltage level of 750V. These parameters guarantee reliable operation even in harsh environmental conditions and protection against the effects of atmospheric storms and other network disturbances.

Installation and operation

The electrical connection is implemented using standard screw terminals, enabling secure fastening of conductors with various cross-sections. The compact design with a net weight of 0.2kg does not add extra load to the installation, and the dimensions allow for easy mounting in existing switchboards.

Practical application

The trip unit serves as additional protection against the effects of overvoltages in various types of electrical installations. The device comes with full technical documentation enabling professional installation by authorized electrical installers. 7-1