Solenoid Coil Assembly for Medium Voltage Vacuum Contactors

Product Specifications

Technical details and manufacturing context for Solenoid Coil Assembly

Definition

The Solenoid Coil Assembly is a critical subassembly within the Medium Voltage Vacuum Contactor Actuator Module. It consists of wound copper wire around a bobbin or core, designed to generate a magnetic field when energized, which drives the mechanical linkage to open or close the vacuum contactor contacts for medium voltage circuit control applications. The assembly includes enamel-insulated copper wire, a bobbin typically made of PBT or nylon, terminal pins or connectors, and insulation materials such as varnish, tape, and sleeve. Key parameters include a standard coil voltage of 24 V DC (±10%), with other voltages available on request; coil power consumption of 8–12 W (holding power, inrush may be higher); insulation class F (155 °C) standard, with class H optional per IEC 60085; dielectric strength of 2.5 kV for 1 minute per IEC 60947; insulation resistance of ≥100 MΩ at 500 V DC per IEC 60255; operating temperature range of -40 to 85 °C with derating above 70 °C; relative humidity ≤95% non-condensing per IEC 60068-2-78; degree of protection IP54–IP65 per IEC 60529; coil resistance of 20–80 Ω at 20 °C (±10%); pull-in voltage ≤85% and drop-out voltage ≥10% of rated voltage per IEC 60947; mechanical life ≥10 million operations under normal load conditions per IEC 60947; and weight of 0.15–0.35 kg depending on coil size and encapsulation. These values are directory reference ranges and must be confirmed for the actual model and application. The assembly operates on the principle that when electrical current flows through the coil, it generates a magnetic field according to Ampere's law, interacting with ferromagnetic components to produce mechanical motion. It is used in medium voltage contactors for switching and control. When selecting, verify the coil voltage, power, insulation class, and environmental ratings with the legal manufacturer or supplier. Regular inspection for insulation resistance and dielectric strength is recommended to detect degradation. Failure modes include coil burnout due to overvoltage or overheating, insulation breakdown, and mechanical wear of the linkage. Always consult the manufacturer for specific application requirements.

Working Principle

When electrical current flows through the wound copper coil, it generates a magnetic field according to Ampere's law. This magnetic field interacts with ferromagnetic components (typically a plunger or armature), creating electromagnetic force that produces linear or rotational mechanical motion to actuate the contactor mechanism. The force is proportional to the number of turns and the current, and the motion is used to open or close the vacuum contactor contacts. The coil is designed to operate within specified voltage and temperature ranges to ensure reliable actuation. The magnetic circuit is optimized to provide sufficient force while minimizing power consumption and heat generation. The plunger or armature moves against a spring or other return mechanism, and the contactor remains in the actuated state as long as the coil is energized. When the current is removed, the magnetic field collapses, and the return mechanism resets the contacts.

Common Materials

Copper wire (enamel insulated), Bobbin (typically PBT or nylon), Terminal pins/connectors, Insulation materials (varnish, tape, sleeve)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Coil Voltage	24 ±10% V DC	Standard control voltage; other voltages available on request.
Coil Power Consumption	8–12 W	Holding power; inrush may be higher.
Insulation Class	F	Class F (155 °C) standard; Class H optional.IEC 60085
Dielectric Strength	2.5 kV	Test voltage for 1 minute.IEC 60947
Insulation Resistance	≥100 MΩ	At 500 V DC.IEC 60255
Operating Temperature Range	-40–85 °C	Continuous operation; derating above 70 °C.
Relative Humidity	≤95 %	Non-condensing.IEC 60068-2-78
Degree of Protection	IP54–IP65	Depends on housing and sealing.IEC 60529
Coil Resistance	20–80 Ω	At 20 °C; tolerance ±10%.
Pull-in Voltage	≤85 %	Percentage of rated voltage.IEC 60947
Drop-out Voltage	≥10 %	Percentage of rated voltage.IEC 60947
Mechanical Life	≥10 million operations	Under normal load conditions.IEC 60947
Weight	0.15–0.35 kg	Depends on coil size and encapsulation.

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 Winding Part
Conducts electrical current to generate magnetic field

Material: Copper wire with enamel insulation
Bobbin Part
Provides structural support and insulation for the coil winding

Material: PBT (Polybutylene terephthalate) or nylon
Terminal Assembly Part
Electrical connection points for power supply

Material: Brass or copper with plating
Insulation Sleeve/Tape Part
Provides electrical insulation between winding layers and to ground

Material: Polyester film, Nomex, or fiberglass

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Frequently Asked Questions

What is the standard coil voltage for this solenoid coil assembly?

The standard coil voltage is 24 V DC with a tolerance of ±10%. Other voltages are available on request, but you must confirm the exact voltage with the legal manufacturer or supplier for your specific application.

What insulation class is standard for this coil?

The standard insulation class is Class F, which corresponds to a maximum operating temperature of 155 °C, according to IEC 60085. Class H is optional. Always verify the insulation class required for your application with the manufacturer.

What is the dielectric strength of this coil?

The dielectric strength is 2.5 kV for 1 minute, tested according to IEC 60947. This is a reference value; the actual value may vary depending on the specific model and must be confirmed with the manufacturer.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C, with derating above 70 °C. This means that at higher temperatures, the coil's performance may be reduced. Always check the manufacturer's specifications for your specific application.

Data Basis

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pressure:	Atmospheric to 2 bar (typical), vacuum compatible
other spec:	Voltage range: 12-240V DC/AC, Duty cycle: 100% ED, Insulation class: F (155°C)
temperature:	-40°C to +85°C (operating), up to +130°C (peak)

Solenoid Coil Assembly

Product Specifications

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Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards