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Watlow
Watlow Solid State Relays
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No online payment · add lines to RFQ BOM
Watlow SSR: 10–75 A; 120/240/480 VAC; DC control; zero-cross. RFQ rating.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Mounting
Back panel (heatsink mounting with thermal foil + Belleville washers)
Output Firing
Zero-cross (time-proportional ~1/10 s cycle)
Output Voltage Range
24 to 660 VAC AC output models; switched VDC model for DC heating
Max Output Current
75 A
Phase Configurations
1-phase
Control Input
DC or AC control inputs (model dependent; WIN-SSR-0124)
Fits heater power switching where you need Watlow solid state relays—AC outputs in 10/25/50/75 A classes for 120/240 VAC (48–280 VAC) or 480 VAC (48–530 VAC), with 3–32 VDC or AC control inputs, zero-cross firing, and back-to-back SCR design; DC 100 V / 20 A option available.
Key advantages
- Current — 10 / 25 / 50 / 75 A class
- Voltage — 120/240 VAC or 480 VAC class; 100 VDC 20 A option
- Control — 3–32 VDC or 90–280 VAC; zero-cross
- Design — Back-to-back SCR AC outputs
- Option — Fast-cycle card for 4–20 mA command
Typical applications
- Electric heater switching.
- Temperature control power stages.
- Industrial SSR panels.
Selection guide
- Amps / voltage
- DC vs AC control
- Heat sink / fuse
Common mistakes
- No heat sink derate.
- Wrong fuse I²t.
- Ignoring ambient curve.
When to RFQ / what to tell us
- Current, voltage, control.
- Quantity, ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 42330 |
| Brand | Watlow |
| Model | Solid State Relays |
| Product type | Solid State Relay |
| Type | Solid state relays for heater power switching (Watlow SSR) |
| Current | 10 / 25 / 50 / 75 A class outputs |
| Voltage | 120/240 VAC (48–280 VAC); 480 VAC (48–530 VAC); 100 VDC 20 A option |
| Control | 3–32 VDC or 90–280 VAC inputs; zero-cross; fast-cycle card option |
| Design | Back-to-back SCR AC outputs |
Documents
FAQ
Q: Current classes? A: 10, 25, 50, and 75 A.
Q: Control? A: 3–32 VDC or 90–280 VAC inputs.
Q: What should I send for a quote? A: Current/voltage/control, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Mounting | Back panel (heatsink mounting with thermal foil + Belleville washers) |
| Output Firing | Zero-cross (time-proportional ~1/10 s cycle) |
| Output Voltage Range | 24 to 660 VAC AC output models; switched VDC model for DC heating |
| Max Output Current | 75 A |
| Phase Configurations | 1-phase |
| Control Input | DC or AC control inputs (model dependent; WIN-SSR-0124) |
| Ambient Operating Range | 25 to 85 °C (77 to 185 °F) |
| Agency Approvals | UL; CSA; SCCR |
| Construction | Back-to-back SCR AC output (not triac-based) |
| Warranty Years | 2 |
| Accessories | Matched semiconductor fuses, heatsinks, thermal foil, Belleville washers; SDA shorted-SSR detector / SBL cards |
| Profiling | No |
| Tru Tune | No |