SQUARE D 47893 MCH Spring Charging Motor

Overview

The SQUARE D 47893 MCH is an automatic spring charging motor mechanism designed for the Schneider Masterpact NW air circuit breaker series under the Square D brand. The SQUARE D 47893 MCH receives 100‑130 V AC control supply and automatically charges the closing spring after the breaker closes or trips, enabling remote electrical closing operation for the ACB. The SQUARE D 47893 MCH is a withdrawable spare accessory and is widely stocked for maintenance and retrofit of Masterpact NW switchgear in industrial power distribution rooms, data centers and marine low‑voltage panels.

Features

The SQUARE D 47893 MCH operates at 100‑130 V AC, 50/60 Hz and completes spring charging within approximately 4 seconds. The SQUARE D 47893 MCH integrates built‑in limit switches to stop the motor once the spring is fully charged, preventing over‑charging and mechanical damage. The SQUARE D 47893 MCH is equipped with status auxiliary contacts for feedback to PLC and SCADA systems, indicating spring charged or spring discharging status. The SQUARE D 47893 MCH adopts plug‑in withdrawable construction, supporting quick replacement without full disassembly of the breaker frame. It matches the original mechanical linkage and mounting interface of Masterpact NW breakers, ensuring compatibility with existing closing and interlock sequences.

Specs

Device Type: Spring Charging Motor (MCH) Model: SQUARE D 47893 MCH Applicable Breaker: Masterpact NW Air Circuit Breaker Control Voltage: 100‑130 V AC, 50/60 Hz Max Charging Time: ≤4 s Mechanical Structure: Withdrawable plug‑on module Auxiliary Contacts: Spring status feedback contacts Operating Temperature: -20°C ~ +60°C Protection Grade: IP20 inside switchgear cabinet

Principle

After the SQUARE D 47893 MCH receives the charging command, the motor drives the gear reducer to tension the closing spring. When the spring reaches full stored energy position, the built‑in limit switch cuts off the motor power supply automatically. The breaker can then perform remote electrical closing. After the breaker closes, the SQUARE D 47893 MCH will restart charging the spring for the next closing cycle.

Applications

The SQUARE D 47893 MCH is installed inside Masterpact NW air circuit breakers to provide automatic spring charging for remote control of low‑voltage main feeders and bus tie breakers. The SQUARE D 47893 MCH is commonly stocked as spare part for emergency replacement and scheduled overhaul of existing Masterpact NW switchgear assemblies. It also supports switchgear modernization and remote closing function upgrade projects.