HONEYWELL Q520A1121 Programmer Subbase (4 sided). The Q520A Wiring Subbase is for BC7000 and R4140 Flame Safeguard Programmers.
• It provides terminals for field wiring, and knife-blade contacts, which are engaged by the spring-connectors on the back of the BC7000 or R4140 chassis.
• The Q520A is available in a 3-sided model with open bottom for cabinet mounting (Q520A1089), and a 4-sided model (Q520A1121).
• Knockouts are provided on the back, top, and bottom (where applicable) for conduit connections.