Overview
The Crydom D2440 solid state relay delivers rugged, maintenance-free switching for AC loads in industrial automation and control systems. Rated for 40A continuous load current across 24–280VAC, this SPST-NO (single-pole single-throw normally open) relay features zero-crossing switching to minimize electromagnetic interference and circuit stress. Its DC control input range of 3–32VDC makes integration straightforward with standard PLC and controller outputs.
Key Features
- 40A load current rating at 24–280VAC operating range
- Zero-crossing switching reduces EMI and inrush current on resistive loads
- SPST-NO configuration for simple on/off load control
- Aluminum base plate and DBC (direct bond copper) substrate for superior heat dissipation and reliability
- Screw terminals with improved SEMS screws for secure, tool-friendly connections
- Panel-mount hockey puck design fits standard 3.5-inch control enclosures; EMC level-3 compliant
Technical Specifications
- Load Current (RMS): 40A maximum
- Load Voltage Range: 24–280VAC RMS
- Control Voltage Input: 3–32VDC
- Output Type: Thyristor (SCR)
- Switching Mode: Zero-crossing
- Peak Surge Current: 625A single cycle
- Isolation Voltage: 4 kV
- Contact Form: SPST-NO
- Terminal Type: Screw
- Housing Material: 94V-0 rated plastic
- Base Plate: Aluminum
- Dimensions: 44.4 × 57.2 mm (W × H), 22.2 mm depth
- Series: 1 (S1)
Typical Applications
The D2440 is used across a broad range of industrial switching tasks:
- AC motor control and soft-start circuits
- Heating element and load switching in process control
- Industrial oven and kiln temperature management
- Pump and fan motor switching
- Lighting control systems in manufacturing facilities
- Test and measurement equipment integration
Compatibility & Replacements
Compatible With
- All standard PLC controllers (Allen-Bradley, Siemens, Mitsubishi, Omron, etc.)
- Standard 24VDC control circuits and relay outputs
- Industrial AC power distribution systems (single or three-phase)
- Control signal levels from 3–32VDC logic circuits
Replaces / Drop-In Replacement For
The D2440 is compatible with systems previously using electromechanical relays or older SSR designs rated for 40A @ 240VAC. Verify exact model compatibility with your system integrator before ordering if replacing a competing brand.
Works With
- Control Systems: PLC outputs, terminal blocks, 24VDC power supplies
- Protection: Fused circuits, surge suppressors, snubber networks
- Thermal Management: Heat sinks (optional); internal snubber standard
- Accessories: Crydom HSP thermal pads, KS-100 protective covers, DIN-rail mounting kits
