Holding solenoid WL3529

lockingself-holdingcompact

Product Overview
The WL3529 is a latching (bistable) electromagnet combining a permanent magnet with an electromagnetic coil to retain position without continuous power. It is available in DC 12V and 24V variants, measures Ø35×29 mm and delivers a nominal holding force of 30 kg (≈300 N). The unit is designed for compact embedded and automation applications where power efficiency and secure holding during power loss are required.

Key Uses / Applications

• Industrial automation and intelligent control systems
• Safety locking and access control mechanisms
• Battery-powered and power-distribution applications
• Robotics and smart manufacturing modules
• Medical devices, transit systems, vending machines and compact embedded controls

Benefits

• Very low energy consumption: power required only during switching pulses
• Maintains holding force when power is removed, increasing safety in outages
• Reduced coil heating and extended coil lifetime due to intermittent energising
• Compact Ø35×29 mm form factor for constrained installations
• Fast and reliable switching when driven with appropriate polarity-control circuitry

Limitations / Considerations

• Requires polarity-reversal or dedicated driver circuitry to release, adding control complexity
• Magnetic design and balancing are more complex than simple non-latching electromagnets
• Higher initial cost may occur due to permanent magnet components
• Performance sensitive to air gap and installation flatness; incorrect drive signals can prevent switching
• Permanent magnet characteristics can degrade at elevated temperatures

How to Select a Latching Electromagnet

• Define required holding force (N): account for load weight, contact surface, safety factor (typically 2–3×) and expected air gap
• Choose voltage and driver compatibility: common options 12V and 24V DC; ensure driver supports pulse operation and polarity reversal or select dual-coil variant
• Verify duty cycle and switching profile: estimate pulses per hour/day, pulse length (ms) and thermal limits (recommended duty cycle 10%)
• Confirm mechanical dimensions and mounting: Ø35×29 mm, mounting thread M5×H19, lead wire exit and connector needs
• Assess environment: operating temperature, moisture/dust exposure, required IP level and magnet temperature sensitivity
• Validate reliability: lifecycle (>500,000 cycles), insulation class B, hi-pot AC750V/2s and available test reports
• Request customization if required: holding force range, voltage, lead length, waterproofing, surface finish and mounting variants

FAQ — Selected Answers

• What is a latching electromagnet? — A bistable magnetic actuator that holds its state without continuous power using a permanent magnet and a switching coil.
• How does it differ from a regular electromagnet? — Regular electromagnets need continuous current to hold; latching types retain hold after power removal.
• Does it require opposite polarity to release? — Yes, release is achieved by applying reverse polarity/current or an alternate coil drive depending on the configuration.
• What voltage options exist? — Commonly available in DC 12V and DC 24V (custom voltages possible).
• Is it safe during power outages? — Yes, it maintains holding force when power is removed, provided the mechanical installation is correct.

Product Datasheet (summary)
Product name: Permanent Electromagnet
Model: WL3529 (listed as WL-3529-24V in some datasheets)
Size: Ø35 × H29 mm
Holding force: 30 kg (≈300 N)
Voltage: DC 12V / 24V
Power (pulse): 28 W
Recommended duty cycle: 10%
Insulation Class: B
Dielectric (Hi-Pot) test: AC 750V / 2s
Service life: >500,000 cycles
Net weight: 168 g
Mounting thread: M5 × H19
Lead wire: bottom exit 25 cm (customisable)
Action form: Energise to release (requires reverse polarity to reset)
Surface finish: zinc electroplating
Materials: steel body, enameled wire coil
MOQ: 2 pcs; sample orders accepted
Warranty: 2 years
Certifications: CE, RoHS
Origin: Dongguan, Guangdong

Technical specifications

• Model: WL3529 (WL-3529-24V)
• Type: Latching / Permanent Electromagnet (bistable)
• Holding force: 30 kg (≈300 N)
• Voltages: DC 12V, DC 24V
• Power (pulse): 28 W
• Recommended duty cycle: 10%
• Insulation class: B
• Hi-Pot: AC 750V / 2s
• Service life: >500,000 cycles
• Net weight: 168 g
• Mounting: M5 × H19
• Lead exit: bottom 25 cm (customisable)
• Surface: zinc electroplating
• Materials: steel, enameled wire
• Action: energise to release (reverse polarity required)