Technical Specifications Nominal Coil Operating Voltage: standard industrial control voltage Tripping Threshold: circuit breaker trips when voltage drops to 35%‑70% of nominal voltage Reset Condition: breaker can close only when control voltage recovers above 85% nominal value Mounting Mode: internal accessory installed inside molded case circuit breaker housing Mechanical Linkage: directly link with circuit breaker internal trip mechanism
Functional Features Trigger circuit breaker automatic trip when control voltage drops below threshold. Prevent automatic load restart after power loss and power recovery. Mechanical linkage with circuit breaker internal trip structure. Only allow breaker closing operation after voltage returns to normal range.
Application Scenarios Molded‑case circuit breaker auxiliary protection for industrial power distribution cabinet. Safety protection for motor load loop to avoid unexpected restart after power restore. Substation low‑voltage distribution cabinet safety interlock accessory.
Performance Parameters Rapid mechanical trip response when voltage falls below threshold setting. Accurate voltage threshold trigger characteristic. Stable mechanical linkage action for long‑term use.
Material Composition Electromagnetic coil and iron‑core assembly. Mechanical trip linkage transmission parts. Insulation plastic structural components.
Structural Features Compact built‑in accessory structure for installation inside MCCB housing. Mechanical driving buckle connects with breaker trip mechanism. External wiring terminals for control power supply connection.
Working Principle Under normal control voltage condition, electromagnetic coil maintains iron‑core pull‑in state and locks breaker closing mechanism. When control voltage drops to trip threshold, electromagnetic attraction force reduces, spring pushes linkage structure to release circuit breaker trip mechanism, and circuit breaker opens main contact. Breaker closing action remains locked until control voltage recovers to normal level.
Installation Requirements Install accessory into designated inner position of matched molded‑case circuit breaker before breaker putting into service. Complete control power wiring according to terminal marking. Confirm mechanical linkage position is correct after assembly.
Usage Notes Control supply voltage must conform to accessory nominal coil specification. Carry out function test for under‑voltage release during breaker commissioning. Do not modify internal mechanical linkage components.
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