Brand: Honeywell
Category: Other
Document Type: Spec Sheet
Language: EN
Available Languages: EN , ES
Spec Sheet for C645A-E
Uploaded: Nov. 21, 2025, 7:29 p.m.
The C645A-E Pressure Switches are safety devices for positive-pressure or differential-pressure systems. They sense gas or air pressure changes. Models C645A,C,D,E break a circuit when pressure falls to the scale setting minus the differential. Model C645B breaks a circuit when pressure rises to the scale setting. They feature a spring-loaded diaphragm actuating a snap-acting Micro Switch, and can be wired to turn on an alarm. Lockout and manual reset are optional. Different models are designed for natural gas, LP gas, air, or distillate fuel oil.
Troubleshooting and error codes
| Model | 120 Vac Full Load | 120 Vac Locked Rotor | 240 Vac Full Load | 240 Vac Locked Rotor |
|---|---|---|---|---|
| C645A | 7.4 | 44.4 | 3.7 | 22.2 |
| C645C | 8.0 | 48.0 | 5.1 | 30.6 |
| C645E | 7.4 | 44.4 | 3.7 | 22.2 |