Product Details
The PML Energize-to-Release Mini Electro-Permanent Magnet inverts the usual logic: it holds with a permanent magnet — no power, no heat, no running cost — and releases only when a pulse of current is applied. That fail-safe behaviour makes it the right choice wherever a load must stay held even if power is lost.
Where They're Used
- Machine tools
- Door locking / holding
- Actuators
- Feeder mechanisms — short-stroke, high-force operation
- Automation: textile, packaging and office machinery
- Grill locking
- Transformers
- Remote hold / release
Models & Specifications
Energize-to-release magnets are permanently energised; applying current at the rated voltage de-energises them for release. Ambient operating temperature is 35°C, and all models come with a central machined hole in the rear end for mounting.
| Mini Electropermanentmagnets | |||||||||
|---|---|---|---|---|---|---|---|---|---|
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Model No. |
Standard Operating Voltage |
Diameter (mm) |
Thickness (mm) |
Holding Force (Kg) |
Current (mm) |
Power (Watts) |
Min.Plate Thickness Requires (mm) |
Connector Type |
|
| M52177 | 24VDC | 35 | 48 | 25 | 240 | 5.2 | 5 |
Hirschmann Connector |
|
| M52177 | 240VAC | 35 | 48 | 25 | 50 | 5.2 | 5 | Hirschmann Connector |
|
| M52178 | 240VAC | 50 | 63 | 50 | 40 | 8.5 | 6 | Hirschmann Connector |
|
In the Field: Robotic Application
The M52177 (240V AC) energize-to-release unit at work in a robotic application:
Frequently Asked Questions
What happens if power fails while it's holding?
Nothing — the hold is permanent-magnetic and needs no power at all. Current is used only to release. This is precisely why safety-critical holds specify energize-to-release.
How does it differ from the Energize-to-Hold model?
They are mirror images: energize-to-hold grips only while current flows (fails released); energize-to-release grips constantly and needs current to let go (fails held). Choose based on which failure state is safe in your design.
Can I get a custom voltage or size?
Yes — these are wound and rated in-house, so custom specifications are part of normal business. Send us your requirement.
Why Buy From PML
- 65+ years of magnetic expertise — Permanent Magnets Ltd has designed and manufactured magnetic products for 65+ years, and our consumer range is built to the same engineering standards we supply to global industrial leaders.
- Made and tested in-house — magnets, assemblies and finished products are manufactured and quality-checked at our own facilities, so every unit performs to its stated specification.
- Honest specifications — the ratings you read on this page are the ratings you get. If your application needs a different size or strength, our engineers will tell you exactly what works — and what won't.
- Support from real engineers — from product selection to after-sales, your questions are answered by the team that builds the product.
Need help choosing, or a custom specification? Enquire now and our engineering team will guide you to the right solution.