Siemens SDH-8A — 120 VAC electromagnetic fire-door holder for overhead rolling doors, dampers and vents.
A door holder is a releasing device, not a notification appliance. Its electromagnet holds a fire barrier open against its own closer, and the panel releases it by interrupting current to the magnet, so an alarm and a loss of power both let the barrier close. The SDH-8 is the heavy-duty member of the series.
- Supply: 120 VAC; SDH series "A" models draw 17 mA AC
- Holding force approximately 120 lbs
- Supporting-wall anchorage must withstand 160 lbs pull
- Consists of electromagnet holding unit, angle bracket, "U" bracket and latch arm
- Test switch fitted; light gray hammer enamel finish
- Heavy-gauge cadmium-plated steel mounting brackets
- For overhead rolling doors, dampers, heat and smoke vents and self-closing windows
- UL and ULC certified, FM approved
Confirm the voltage before ordering: the SDH-8D is the 24 VDC version of the same holder and the two are not interchangeable.
