Trip Solenoid for Circuit Breakers - Specifications & Verification

Product Specifications

Technical details and manufacturing context for Trip Solenoid

Definition

A trip solenoid is an electromagnetic component within a circuit breaker trip unit that converts electrical signals into mechanical force to initiate the breaker's disconnection mechanism. It serves as the primary actuator that physically releases the latch or triggers the mechanism that opens the circuit when overcurrent, short circuit, or other fault conditions are detected by the trip unit's sensing elements. The solenoid consists of a coil wound on a bobbin, a movable plunger or armature, a return spring, and a housing. When the trip unit sends an electrical signal, the coil energizes, creating a magnetic field that attracts the plunger, which then moves to release the latch or activate the opening mechanism. The return spring resets the plunger after the signal is removed. Key parameters include coil voltage (24 V DC ±10% per IEC 60038), coil resistance (20–30 Ω at 20°C, tolerance ±5%), pull-in voltage (≤75% of nominal per IEC 60947), drop-out voltage (≥10% of nominal per IEC 60947), operating temperature range (-40 to 85°C per IEC 60068-2-1/2), insulation class F (155°C) standard with class H available per IEC 60085, degree of protection IP54–IP65 per IEC 60529, mechanical life ≥100,000 cycles and electrical life ≥50,000 cycles per IEC 60947-5-1, response time ≤50 ms per IEC 60947, weight 0.5–1.5 kg, and mounting screws M4–M6 per DIN 912. Materials include copper wire for the coil, electrical steel for the core, plastic for the bobbin/housing, and spring steel for the return spring. These values are reference ranges; verify model-specific values with the manufacturer.

Working Principle

When the trip unit detects a fault condition (overcurrent, short circuit, etc.), it sends an electrical signal to the trip solenoid coil. This energizes the coil, creating a magnetic field that attracts a plunger or armature. The resulting mechanical movement either directly releases the circuit breaker's latch mechanism or activates a secondary mechanism that causes the breaker contacts to open, thereby interrupting the electrical circuit. After the fault is cleared and the signal is removed, the return spring resets the plunger for subsequent operations.

Common Materials

Copper wire (coil), Electrical steel (core), Plastic (bobbin/housing), Spring steel (return spring)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Coil Voltage	24 ±10% V DC	Standard control voltage; other voltages available on requestIEC 60038
Coil Resistance	20–30 Ω	At 20°C; tolerance ±5%
Pull-in Voltage	≤75% of nominal	Must be ≤75% of rated voltage for reliable operationIEC 60947
Drop-out Voltage	≥10% of nominal	Must be ≥10% of rated voltage to ensure releaseIEC 60947
Operating Temperature	-40–85 °C	Extended range availableIEC 60068-2-1/2
Insulation Class	F	Class F (155°C) standard; H availableIEC 60085
Degree of Protection	IP54–IP65	IP65 for dusty/humid environmentsIEC 60529
Mechanical Life	≥100000 cycles	Under normal operating conditionsIEC 60947-5-1
Electrical Life	≥50000 cycles	At rated loadIEC 60947-5-1
Response Time	≤50 ms	Time from energization to contact openingIEC 60947
Weight	0.5–1.5 kg	Depends on coil and mounting
Mounting	M4–M6 screw	Thread size for mounting screwsDIN 912

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Coil Part
Generates electromagnetic field when energized
Plunger/Armature Part
Moves under magnetic force to trigger mechanical release
Bobbin Part
Supports and insulates the coil windings
Core Part
Concentrates and directs magnetic flux
Return Spring Part
Returns plunger to resting position when de-energized

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Circuit Breaker Trip Unit

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Manufacturers of Trip Solenoid

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Frequently Asked Questions

What is the function of a trip solenoid in a circuit breaker?

A trip solenoid is an electromagnetic actuator that converts an electrical signal from the trip unit into mechanical force to release the breaker's latch or trigger the opening mechanism, thereby disconnecting the circuit during fault conditions.

What are the typical coil voltage and resistance values?

The standard coil voltage is 24 V DC ±10% per IEC 60038, and coil resistance is 20–30 Ω at 20°C with ±5% tolerance. Other voltages may be available on request; always verify with the manufacturer.

What standards apply to trip solenoids?

Relevant standards include IEC 60038 for voltage, IEC 60947 for performance (pull-in/drop-out voltage, response time), IEC 60068-2-1/2 for temperature, IEC 60085 for insulation, IEC 60529 for protection, and IEC 60947-5-1 for mechanical/electrical life. These are verification references, not certification proof.

How should I verify the suitability of a trip solenoid for my application?

Check the specified parameters (voltage, resistance, temperature range, protection degree, life cycles) against your application requirements. Confirm model-specific values and compliance with the legal manufacturer or supplier before procurement.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0 to 10 bar
other spec:	Coil voltage tolerance: ±10% of rated voltage
temperature:	-40°C to +85°C

Trip Solenoid

Product Specifications

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