Movable plunger: Diameter 3-25 mm, Coil Voltage 12-240 V DC/AC

Q: What causes movable plunger sticking in solenoid applications?

Sticking typically results from contamination buildup, corrosion, misalignment, or inadequate lubrication. Magnetic remanence in soft materials can also cause adhesion.

Q: How do you select plunger material for high-cycle applications?

Choose materials with low coercivity (like silicon steel) to minimize hysteresis losses, combined with wear-resistant coatings for durability exceeding 10 million cycles.

Component Specifications

Definition

A movable plunger is a cylindrical ferromagnetic core that moves axially within an electromagnetic solenoid coil. When energized, magnetic flux creates force along the plunger's axis, producing linear displacement. In magnetic trip systems, this motion triggers mechanical disconnection by releasing latch mechanisms or directly interrupting current paths. The component features precise dimensional tolerances, optimized magnetic properties, and surface finishes to minimize friction and hysteresis losses.

Working Principle

Operates on electromagnetic force generation: when coil energizes, it creates a magnetic field that attracts the ferromagnetic plunger toward the coil's center. This linear motion continues until magnetic force balances with spring resistance or mechanical stops. De-energizing allows return springs to reset the plunger. In trip applications, the plunger's sudden movement mechanically releases a latch or contact mechanism.

Materials

Low-carbon steel (1008-1010), silicon steel (M-19, M-36), or ferritic stainless steel (430) for magnetic properties; sometimes plated with zinc, nickel, or chrome for corrosion resistance; non-magnetic guides may use brass or aluminum bronze.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Force	5-200 N
Stroke	2-50 mm
Diameter	3-25 mm
Coil Voltage	12-240 V DC/AC
Response Time	<20 ms
Insulation Class	B/F (130°C/155°C)
Operating Temperature	-40°C to +120°C

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

Standards

ISO 4401, DIN 24340, IEC 60947-1

Parent Products

This component is used in the following industrial products

Electromagnetic Solenoid (Magnetic Trip)

A protective component within output circuit breakers that uses electromagnetic force to trigger instantaneous trip during short-circuit conditions.

View Product Details

Engineering Analysis

Risks & Mitigation

Magnetic saturation reducing force
Mechanical wear from misalignment
Corrosion in humid environments
Coil overheating damaging insulation

FMEA Triads

Trigger: Contamination ingress
Failure: Restricted movement causing delayed trip response
Mitigation: Install protective boots and specify IP65+ sealing

Trigger: Material fatigue from cyclic loading
Failure: Fracture at stress concentration points
Mitigation: Implement shot peening and radiused transition designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.02 mm diameter, ±0.05 mm length, Ra 0.8 μm surface finish

Test Method

Stroke-force curve measurement per ISO 4401, dielectric strength test at 2kV, salt spray test per ASTM B117

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Movable plunger

Manufacturer profiles associated with Movable plunger.

Sourcing Movable plunger from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Contact Plate

A conductive plate in motor terminal blocks that establishes electrical contact between conductors.

Marking Strip

A durable marking strip used for terminal identification in motor terminal blocks to ensure proper electrical connections and safety compliance.

Gland Body

A gland body is the main housing component of an aluminum cable gland that provides mechanical protection and environmental sealing for electrical cables entering enclosures.

Current Sense Resistor

A precision resistor used to measure current flow in electrical circuits by converting current to a measurable voltage drop.

Frequently Asked Questions

What causes movable plunger sticking in solenoid applications?