System Sensor B404BT 4-wire base w/current limiting resistor A&C relay

4-wire base with current limiting resistor, Form A&C relay contacts, and Form A Supervisory contact, for use with 400 Series smoke detectors.

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The B404BT is a 4-wire base with current limiting resistor, Form A&C relay contacts, and Form A Supervisory contact, without the transformer that is included with the B404B, for use with 400 Series smoke detectors.

UPC: 783863011825
Also known as: BK-B404BT



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