These Vandal Resistant fireman switches are manufactured from 12 gauge stainless steel with both drop key and crescent key versions available. The switches have a flush galvanised back box as standard, however optional surface back boxes: 171E/SB (for the crescent key switch) 170E/SB (for the drop key switch) The drop key affords a higher level of security against misuse than other conventional fireman switches and it has been accredited by Secured by Design, the official UK Police flagship initiative combining the principles of ‘designing out crime’ with physical security. The drop key fireman switch is fitted with a double pole heavy-duty DPDT micro switch, while the crescent key switch has a single pole SPDT micro switch. Micro switch FS/CK FS/DK Switch Type SPDT (lever) DPDT (plunger) Contacts single pole (CO, NO, NC) double pole (2x CO, NO, NC) Current Rating 16A @ 250Vac 15A @125V/250Vac FlammabilityRating UL94V-0 UL94HB Working Temp -40°C to +85°C -40° to +105°C Operation Cycles(min.) 10,000 6000
