ERI 001 SJDA 242500 25A SOLID STATE RELAY(USED)
Share :
The ERI 001 SJDA 242500 is an industrial-grade Single-Phase Solid State Relay (SSR). Based on the model nomenclature, it is designed for standard AC load switching, typically used in heating control, motor starting, or as an output switch for high-power inverters.
Load Current:25A (Continuous, with proper heat sinking).
Load Voltage:24V to 280V AC (Standard "240" range).
Control Voltage:3V to 32V DC (Logic-level compatible).
Switching Type:Zero-Cross Switching. It turns on only when the AC sine wave crosses the 0\V point, which prevents the massive electromagnetic interference (EMI) that occurs when switching at peak voltage.
Opto-Isolation: The control side (your EGS002 or Arduino) is physically and electrically isolated from the high-voltage AC side via an internal optocoupler. This protects your low-voltage electronics from 220V surges.
Zero-Cross Advantage: Because you are working with Pure Sine Wave Inverters, using a Zero-Cross SSR ensures that the relay "waits" for the perfect moment to engage the load, preventing stress on your filter capacitors and inductors.
LED Indicator: Most ERI models include an onboard LED that illuminates when the DC control signal is active, making it very easy to troubleshoot your circuit.
An SSR is essentially a large transistor. Even though it has no moving parts, it has an internal resistance that creates heat. At 25A, this relay will generate approximately 30W of heat.
Heat Sink: You must not run this at 25A without an aluminum heat sink. Without one, the internal junction will overheat and fail (usually in the "ON" position) within seconds.
Thermal Paste: Apply a thin, even layer of thermal grease between the metal base of the SSR and the heat sink to ensure maximum heat transfer.
| Feature | ERI 001 SJDA (25A) | Crouzet GN (25A Dual) | Crydom D4850C (50A) |
| Channels | Single | Dual | Single |
| Voltage Max | 280V AC | 600V AC | 530V AC |
| Current | 25A | 25A x 2 | 50A |
| Best Use | General AC loads | L+N Switching | High Power (e.g., 5kW) |
Terminal 1 & 2 (Load): Place these in series with your 220V AC Live wire.
Terminal 3 (+) & 4 (-): Connect these to your 5V or 12V control signal. If using the EGS002 board, you can trigger this relay from the protection or "Run" signal pins to act as a silent AC output gate.