You have no items in your shopping cart.

Call for Sales or Support:


Monday-Friday 8AM-8PM EST

System Sensor B501 Plug-in Detector Base

69 in stock
90 Days
- +

Questions (2)

What if I need to return this?
All products are covered by our 90-day warranty and come with a prepaid UPS return label and RMA form. Returning products has never been this easy.
What if I need support?
Our friendly team is on hand with expert advice and assistance. Contact us Mon-Fri 8am-8pm by phone (888.303.2656), by email ( or using our online chat. Responses within 1 business day (if not sooner!)

Product Description

NOTE: This part is discontinued by the manufacturer. Replace with: B501-WHITE(white) or B501-BL(black) or B501-IV(ivory)

The System Sensor B501 Plug-in Detector Base is a 4" European-style flangeless mounting base for use with a variety of plug-in detector heads.
Please note: All parts should be installed and tested by a certified fire alarm company.