Crydom D1225 SPST-NO Relay
The Crydom D1225 is a solid SPST-NO (Single Pole Single Throw - Normally Open) solid state relay designed for reliable switching of AC loads. It features a load voltage of up to 280 VAC and a current rating of 25 Amps. The D1225 offers superior performance with optical isolation to protect control circuits and ensure noise-free switching, making it ideal for industrial automation, heating, lighting, and motor control applications.
- Model
- Crydom D1225
- Calibration
- Available on request
- Price
- $40
- Status
- In stock
- RFQ ref
- D1225
This unit
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.
Specifications
| Parameter | Value |
|---|---|
| Voltage / Current Range | 24-140 VAC (load), 3-32 VDC (control) |
Crydom D1225 — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Crydom D1225. Calibration covers I/O channel accuracy per specification, analog output and input calibration to rated accuracy, and functional communication interface test (serial, Ethernet, fieldbus). All calibrations ship with a NIST-traceable certificate. Turnaround is typically 1–3 business days after receipt.
Common Crydom D1225 faults: blown I/O fuses, failed analog modules, power supply capacitor failure. Common faults include blown I/O protection fuses, failed analog I/O modules, power supply capacitor failure, and serial or Ethernet communication port damage.
Crydom D1225 price
This Crydom D1225 is listed at $40. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Crydom D1225 calibration cost
NIST-traceable calibration for the Crydom D1225 is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Calibration for this instrument covers I/O channel accuracy per specification, analog output and input calibration to rated accuracy, and functional communication interface test (serial, Ethernet, fieldbus). Turnaround is 1 to 3 business days after receipt. See full calibration details →
