Overview
The Crydom S228 solid state relay is a Series 2 panel-mount control device engineered for industrial automation and equipment control. With a 3.5-8V DC input range and an 8-amp output rating at 40–280V AC, this relay offers reliable switching of AC loads without mechanical contacts. The zero-crossing switching technology minimizes electrical noise and inrush currents, making it ideal for motor starters, heaters, and lighting control in demanding industrial environments.
Key Features
- Panel-mount solid state relay (SPST-NO configuration)
- 3.5–8V DC control input (low-voltage logic compatible)
- 8-amp maximum load current at 40–280V AC output
- Triac output device with zero-crossing optical isolation
- Reduces electrical noise and surge currents vs. mechanical relays
- Compact design fits standard equipment control panels
Technical Specifications
| Control Input Voltage | 3.5–8V DC |
| Output Load Voltage | 40–280V AC (RMS) |
| Output Current Rating | 8A |
| Output Device Type | Triac |
| Switching Type | Zero-Crossing (Optical Isolation) |
| Configuration | SPST-NO (Single Pole Single Throw, Normally Open) |
| Mounting Style | Control Panel / DIN-style |
| Series | Crydom Series 2 |
| Manufacturer | Sensata Technologies / Crydom |
Typical Applications
- Motor control and soft-starting circuits
- AC heating element control (ovens, water heaters)
- Industrial lighting and dimming circuits
- Temperature control in process equipment
- Pump and fan motor switching
- Equipment interlocks and safety circuits
Compatibility & Replacements
Compatible With
- Low-voltage DC control systems (3.5–8V logic)
- PLC discrete outputs and field I/O
- Standard equipment control panels (mounted on DIN rail or chassis)
- AC load circuits rated 40–280V, up to 8A
- Zero-crossing switching environments (minimizes EMI)
Replaces / Drop-In Replacement For
- Crydom S228 (direct equivalent for same specifications)
- Verify compatibility with EZ240D12 or similar Crydom Series 2 models for your specific application
Works With
- DC control logic from PLCs, microcontrollers, and field devices
- 3.3V to 8V compatible I/O outputs
- Standard AC industrial load switching (motors, heaters, lighting)
- No programming or configuration required (hardwired relay operation)
