Holding force
A magnetic lock has a metal plate surrounded by a coil of wire that can be
magnetized. The number of coils determines the holding force which characterizes
the lock:
- Micro Size: 300 lbs (1,300 N) holding force.
- Mini Size: 600 lbs (2,700 N) holding force
The standard size electromagnetic lock is used as a gate lock.
Electrical Requirements
The power for an electromagnet lock is DC (Direct Current), around 6 W. The
current is around 0.5 A when the power is 12 V DC. Generally, the specification of
the electromagnet locks is dual voltages 12/24 V DC. Single voltage output can be
required for 12 V DC or 24 V DC applications. The figure presents the relationship
between voltage and holding force. When the current is fixed, voltage is
proportional to power consumption.
Application modes
For safety purposes, electric locks can be designed to operate in one of two modes:
Fail-Safe – to protect people: The lock is released if power cuts off.
Fail-Secure – to protect property: The lock remains closed if power cuts off.
An electromagnet lock is normally used in Fail-Safe situations, so it must satisfy
applicable fire regulations so as to be safe in emergency situations.
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