SIEMENS 3WX3151-1JJ00 Shunt Trip and Closing Coil for 3WN1 Air Circuit Breaker

Overview

The SIEMENS 3WX3151-1JJ00 is a combined shunt trip and closing coil accessory designed for Siemens 3WN1 series low voltage air circuit breakers. The SIEMENS 3WX3151-1JJ00 receives control voltage signals from external PLC or relay circuits to execute remote breaker closing and remote shunt trip actions. It is installed inside the 3WN1 breaker mechanism compartment and acts as the actuator for electrical remote operation. The SIEMENS 3WX3151-1JJ00 is an obsolete spare part widely stocked for maintenance and retrofit of legacy 3WN1 distribution switchgear.

Features

The SIEMENS 3WX3151-1JJ00 supports dual functions including closing coil and shunt trip coil in one assembly. The rated control voltage is 240V AC and 125V DC for trip and closing command. The SIEMENS 3WX3151-1JJ00 includes internal surge suppression to reduce voltage spike impact on control circuit contacts. It adopts original mechanical mounting structure and wiring terminal layout, supporting direct plug-in replacement for the same type 3WN1 breaker. The SIEMENS 3WX3151-1JJ00 is designed for short-time energization operation and must be controlled by auxiliary contact interlock to avoid continuous coil burnout.

Specs

Device Type: Shunt trip and closing coil assembly Model: SIEMENS 3WX3151-1JJ00 Applicable Breaker: Siemens 3WN1 air circuit breaker Control Voltage: 240V AC / 125V DC Function: Remote close, remote shunt trip Operation Mode: Short time energized Mounting: Inside breaker mechanism compartment Weight: Approx 0.12 kg Application: Low voltage main incoming cabinet, bus tie breaker, remote control switchgear

Principle

The SIEMENS 3WX3151-1JJ00 converts electrical control pulse into mechanical force to drive the breaker closing mechanism or trip latch. When the closing coil is energized, the breaker completes charging and closing action. When the shunt trip coil receives trip command, it releases the breaker latch and opens the main contacts. The auxiliary contacts of the circuit breaker cut off the coil power immediately after action. If the coil stays energized continuously, the SIEMENS 3WX3151-1JJ00 will overheat and be damaged.

Applications

The SIEMENS 3WX3151-1JJ00 is used for remote electrical operation of 3WN1 main incoming and bus tie breakers in industrial power distribution rooms. It serves DCS remote trip and closing control for power plant auxiliary power systems. The SIEMENS 3WX3151-1JJ00 applies to spare stock and emergency repair of old 3WN1 breaker cabinets. It also supports renovation projects of legacy Siemens low voltage distribution switchgear.