The Crydom D1225 is a photo-coupled solid-state relay with SPST-NO contact configuration, engineered for AC load switching across 24 VAC to 140 VAC systems. This Series 1 device delivers 25 A maximum load current with SCR output topology optimized for heavy industrial switching demands. Zero-crossing operation minimizes EMI and extends load life, while the back-to-back SCR architecture handles inrush transients up to 250 A peak at 16.6 ms intervals.
## Technical Specifications
• **Load Voltage Range:** 24 VAC to 140 VAC
• **Maximum Load Current:** 25 A
• **Control Voltage:** 3 VDC to 32 VDC
• **Input Current:** 7 mA to 12 mA
• **On-State Voltage Drop:** 1.15 Vrms (maximum)
• **Off-State Leakage Current:** 8 mA RMS (maximum)
• **Switching Time:** 1/2 cycle (maximum)
• **Blocking Voltage:** 600 V
• **Surge Current Rating:** 250 A peak @ 16.6 ms
• **Dielectric Strength:** 4000 V RMS
• **Input Impedance:** 1500 Ohms nominal
• **Thermal Resistance (J-to-C):** 1.02 °C/W
• **Capacitance:** 8 pF
## Key Features
• Zero-voltage crossing for resistive load applications
• Direct bond copper substrate for superior thermal management
• Internal snubber circuitry
• Aluminum base plate with UL94V-0 housing
• Screw terminal connections (4-pin)
• Optional LED input status indicator (G option)
• Optional overvoltage protection module (P option)
• Epoxy-free design with anti-rotation barriers
## Typical Applications
Heater control, motor soft-starts, lighting systems, industrial process automation, and AC equipment switching in temperature-controlled environments (-40 °C to +80 °C).
## Compatibility & Integration
Panel or chassis mount hockey-puck package measuring 57.3 × 44.5 × 22.6 mm. CE, CSA, TUV, and UL approved per EN 60950-1 with Level-3 EMC compliance. RoHS compliant with no SVHC content.
