Overview
The Potter & Brumfield CDB-38-70005 is a proven on-delay time delay relay widely used in industrial automation, motor control, and sequential logic applications. This DPDT (double-pole, double-throw) relay delivers adjustable timing from 1.8 to 180 seconds, making it suitable for applications requiring precise control over relay activation delays. The unit operates on 120VAC input and is designed for reliable performance in control panels and enclosures.
Key Features
- On-delay timing mode with no timing cycle interrupt transfer
- Adjustable delay range: 1.8 to 180 seconds via front knob
- DPDT (Form C) contact configuration for flexible switching logic
- Contact rating: 10A at 30VDC, 277VAC maximum
- 120VAC nominal input; operates 105–130VAC range
- Termination: 0.187″ quick-connect/solder terminals
- Compact yellow plastic enclosure with standard 8-pin footprint
- Socketable design compatible with standard 8-pin relay sockets
Technical Specifications
- Input Voltage: 120VAC nominal (105–130VAC operating range)
- Contact Configuration: DPDT (2 Form C)
- Contact Rating: 10A at 30VDC; 10A at 277VAC
- Time Delay Range: 1.8–180 seconds (on-delay)
- Adjustment Method: Knob (front accessible)
- Termination: 0.187″ quick-connect or solder lugs
- Enclosure: Yellow plastic, 8-pin standard octal format
- Mounting: Panel mount via 8-pin socket or direct solder
- Operating Temperature: Standard industrial range (typical -10°C to +60°C)
- Timing Accuracy: Delay on operate; no cycle interrupt transfer
Typical Applications
- Motor Control: Soft-start delays, pump priming, sequence control
- Sequential Logic: Multi-step automation processes requiring timed pauses between operations
- Alarm & Detection: Delayed activation of warning circuits to avoid nuisance triggers
- Fan/Compressor Protection: Timed cool-down delays after shutdown
- Conveyor & Material Handling: Synchronized timing between driven elements
- HVAC Systems: Damper actuation, stage switching, furnace lockout timers
Compatibility & Replacements
Compatible With
- Standard 8-pin octal relay sockets (DIN rail or screw-terminal mounts)
- 24VDC, 48VDC, 120VAC, 240VAC control circuits
- Motor starters, contactors, and programmable controllers requiring timed switching
- Industrial control panels using discrete relay logic
- HVAC, production machinery, and facility automation systems
Replaces / Drop-In Replacement For
- Legacy CDB-38 series time delay relays with matching 8-pin octal footprint and 1.8–180 second timing range
- Other 120VAC DPDT on-delay relays with similar contact ratings
- Verify exact timing range and contact specifications with your system integrator before ordering as a replacement
Works With
- Potter & Brumfield 27E122 (8-pin screw-terminal socket, 10A rated)
- Potter & Brumfield 27E891 (8-pin DIN rail snap-mount socket, 10A rated)
- Standard contact renewal kits for CDB series relays
- Discrete 120VAC control systems and older PLC I/O modules with relay outputs
