Energise-to-Hold Electromagnet

Overview - Energise-to-Hold Electromagnet

Standard Electromagnets (Energise-to-Hold Electromagnets/Electro-holding magnets)

Energise-to-Hold Electromagnets are standard industrial electromagnets designed to deliver high clamping forces with controlled magnetic activation. Each unit is constructed around a solenoid (copper wound coil) mounted within a high-quality, highly permeable iron assembly, ensuring strong magnetic performance with low magnetic losses and low remanence.

The electromagnet body consists of a sturdy iron cylinder with a bright nickel-plated finish, passivated for durability and corrosion resistance, and incorporates body mounting for secure installation. The rear face of the electromagnet features one central tapped hole and three equi-spaced tapped holes on a pitch circle diameter (PCD), providing flexible mounting options for engineered assemblies. A range of armature plates (keeper plates) is available to suit each electromagnet size and maximise holding performance.

Electrical Connections and Supply Options

Depending on the unit size, Energise-to-Hold Electromagnets are available with three styles of electrical connection:

• Free leads

• Two-pole connector

• Hirschmann connector

These electromagnets support multiple supply voltages, depending on size:

• 12V DC

• 24V DC

• 240V AC

All units are designed for continuous operation, with an ED rating of 100%. The standard ingress protection rating is IP54, with the two-pole connector version rated at IP20.

Performance Characteristics

Energise-to-Hold Electromagnets offer maximum pull force ratings from 113N up to 3500N (approximately 11kg to 350kg), depending on the size of the unit. Actual pull force achieved will depend on the application, surface condition, air gap, and use of appropriate armature plates.

Electrical current is required to turn the magnet ON, and removal of power turns the magnet OFF, providing precise control over magnetic holding.
Approximate pull force conversion:
1kg ≈ 10N ≈ 2.2lb

The use of high-quality permeable iron ensures strong magnetic attraction while minimising residual magnetism when power is removed.

Typical Applications

Energise-to-Hold Electromagnets are commonly used for:

• Door locking mechanisms for access control and security

• Fire door holding systems

• Medical devices and equipment

• Feeder systems for automated packaging machinery

• Pick-and-place equipment

• Power generation and industrial automation systems

They are designed to withstand demanding holding and clamping applications where controlled magnetic activation is essential.

Advantages of Energise-to-Hold Electromagnets

• Magnetic clamping only when energised

• Clamping force can be adjusted by varying the electrical current

• High magnetic holding forces achievable

• Simple and reliable on/off operation

• Suitable for continuous duty applications

Learn the differences between Electromagnets & Permanent Magnets with our free guide here

Find out more about  Electromagnets & Electromagnetism.