Hekatron THM-311 Electromagnetic Door Retainer "Design"
Hekatron electromagnetic door retainers are used to keep self-closing doorways such as fire doors, smoke doors and other doors or gates open. They must be linked to a smoke detection system, which, if a fire occurs, breaks the circuit to deenergize the electromagnet and allow the door to close, thus stopping the fire and smoke from spreading.
For wall mounting
Integral spark-suppression diode
Polarity reversal protection
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