Overview
The Eaton Cutler-Hammer D4PR21A is a compact DPDT relay with integrated indicator light, designed for industrial control and general-purpose switching applications. Featuring a 120V AC coil and 5A contact rating, this slim-form plug-in relay delivers reliable performance in HVAC, machinery control, and automation panels where space is at a premium.
Key Features
- DPDT (double-pole, double-throw) contact configuration for flexible switching control
- Integrated indicator light for visual confirmation of relay state
- 120V AC coil voltage with standard 8-blade terminal interface
- Slim-form design fits tight panel spaces and compact control enclosures
- Built-in hold-down clip for secure panel or DIN rail mounting
- 5A resistive load rating at 240V AC; 2A inductive load at 250V AC
Technical Specifications
- Coil Voltage: 120V AC
- Contact Configuration: DPDT
- Contact Rating (Resistive): 5A @ 240V AC / 30V DC
- Contact Rating (Inductive): 2A @ 250V AC / 3A @ 30V DC
- Maximum Switching Voltage: 380V AC / 125V DC
- Terminal Style: 8-Blade Plug-In
- Mounting: Panel or DIN Rail (with socket D4PA2)
- Dimensions: 1.14″ L × 0.51″ W × 0.5″ H
- Weight: 0.05 lbs
- Series: D4
- Indicator: LED Indicator Light
- RoHS Compliant: Yes
Typical Applications
- HVAC control and circulation pump switching
- Motor starting and speed control circuits
- Heating and cooling equipment interlocks
- Industrial machinery sequential control
- Electrical panel and automation system switching
- Remote switching in confined or tight enclosure spaces
Compatibility & Replacements
Compatible With
- Eaton Cutler-Hammer D4PA2 DIN rail socket (for socket mounting)
- Standard 8-pin octal relay sockets rated for D4 series plug-in relays
- Industrial control panels using 120V AC control circuits
- HVAC and machinery control systems
Replaces / Drop-In Replacement For
- D4PR21T (24V AC coil variant of same form factor)
- D4PR21T1 (24V DC coil variant)
- Other DPDT relays with 8-blade octal terminal interface in equivalent voltage range
Works With
- Cutler-Hammer control components and relay logic systems
- Standard 120V AC control voltage supplies in industrial panels
- DIN rail mounting systems (via optional D4PA2 socket)
- Both panel-mounted and socket-mounted relay configurations
