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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Voltage | 85–264V AC (47–63 Hz) or 120–370V DC |
| Input Current | 2.8A max at 115V AC, 1.4A at 230V AC |
| Inrush Current | <30A at 115V AC, <60A at 230V AC (cold start) |
| Output Voltage | 24V DC nominal (adjustable 22–28V DC) |
| Output Current | 10A continuous, 15A peak (5 sec) |
| Output Power | 240W continuous, 360W peak |
| Ripple & Noise | <50 mV peak-to-peak (20 MHz bandwidth) |
| Line Regulation | ±0.5% |
| Load Regulation | ±1.0% (0% to 100% load) |
| Efficiency | 90% typical at 230V AC / full load |
| Hold-up Time | >20 ms at 240W load |
| Overcurrent Protection | 105–130% of rated, hiccup mode auto-recovery |
| Overvoltage Protection | 28–32V DC, latch mode (cycle input to reset) |
| Overtemperature Protection | 80°C internal, shutdown with auto-recovery |
| Isolation | Input to output: 3000V AC, Input to ground: 1500V AC |
| MTBF | >500,000 hours (Telcordia SR-332) |
| Operating Temp | -25 to +70°C (-13 to 158°F), derate 2.5%/°C above 50°C |
| Storage Temp | -40 to +85°C (-40 to 185°F) |
| Humidity | 5% to 95% non-condensing |
| Dimensions (H x W x D) | 124 x 65 x 115 mm (4.88 x 2.56 x 4.53 inches) |
| Weight | 0.85 kg (1.87 lbs) |
| Mounting | DIN rail (TS35/7.5 or TS35/15) |
| Terminals | Screw type, 0.5–16 mm² (AWG 20–6) |
| Status LED | DC OK (green) |
| Approvals | UL 508, CSA C22.2, EN 60950-1, CE, RoHS |
4. Product Introduction
The GE SPST240 is a 240W, 24V DC DIN rail power supply for industrial control panels, PLC systems, and automation cabinets. It takes 85–264V AC universal input and delivers 10A continuous at 24V DC. You’ll find this in factory automation, process control, HVAC, and material handling applications where reliable 24V power is required.
The SPST240 uses active power factor correction (PFC >0.95) and achieves 90% efficiency — it runs cool enough to mount next to sensitive electronics. Key features include overload hiccup protection (auto-recovery), overvoltage latch protection, and overtemperature shutdown. The DC OK LED and relay output (optional) integrate with PLC monitoring. Unlike cheaper supplies, the SPST240 holds up for 20ms on input dropout — enough to ride through most power sags.
- SPST240
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Green LED off, no output | Input power missing or internal fuse blown | ✅ High | Measure input voltage at L/N terminals (85–264V AC). Check upstream breaker. | Replace SPST240 if input present but no LED. Do not attempt fuse replacement. |
| Green LED flashing (1 Hz) | Output overload or short circuit | ✅ High | Disconnect load. If voltage returns to 24V, load exceeds 10A or has short. | Find and clear the short. The supply recovers automatically when overload clears. |
| Green LED off, output voltage present | LED circuit failed | ❌ Low | Measure output voltage at V+/V- terminals. If 24V present, LED is dead but supply works. | Continue using. Replace during scheduled maintenance if LED status matters. |
| Output voltage cycling on/off (hiccup mode) | Overload or output capacitor short | ✅ High | Measure output resistance with power off. Below 2 ohms indicates shorted load or cable. | Disconnect load one device at a time to find the short. Supply will recover. |
| Output measures 18V or lower | Overload or regulator failure | ✅ High | Measure at supply terminals, not at load. Voltage drop across long cables causes this. | If voltage low at supply, replace unit. If voltage OK at supply but low at load, increase wire gauge. |
| Supply hot to touch, fan not running (if equipped) | Overload or fan failure | ✅ High | Check load current with clamp meter. Compare to 10A rating. | Reduce load or replace with higher-wattage supply (e.g., SPST480). |
| Humming or buzzing noise | Internal magnetics vibration | ❌ Low | Normal under heavy load. Compare to known-good unit. | If noise is loud or changes pitch erratically, replace preemptively. |
| Ripple >200 mV (oscilloscope measurement) | Output capacitor aging | ✅ Medium | Measure ripple at V+/V- terminals with 10A resistive load. | Replace supply. High ripple will damage sensitive analog inputs. |
Tech Note: The SPST240 is a switching power supply with active PFC. It generates some electrical noise — keep it at least 10 cm from analog signal wires. Use shielded cables for sensitive measurements.
6. Frequently Asked Questions (FAQ)
Q: Is the GE SPST240 a direct replacement for other 240W power supplies like the Mean Well SDR-240-24?
A: Mostly, but check your mounting and wiring. The SPST240 has the same DIN rail footprint and terminal layout as most 240W supplies. Output is 24V adjustable 22–28V. Input is universal AC. The difference: the SPST240 has hiccup current limiting (auto-recovery) vs. constant current limiting on some competitors. If your system expects constant current behavior during overload, the hiccup mode may cause controller resets. Test before deploying in critical applications.
Q: Can I parallel two SPST240 supplies for 20A output?
A: No. The SPST240 does not have active current sharing. Paralleling them will cause one supply to carry most of the load while the other idles or oscillates. If you need 20A, buy a single 480W supply (SPST480 or similar). For redundancy (diode-ORed), you can parallel them with blocking diodes, but you’ll lose 0.7V across each diode.
Q: Why is my SPST240 tripping the upstream 10A circuit breaker on power-up?
A: Inrush current. The SPST240 draws up to 60A for 1–2 milliseconds at cold start. A standard 10A breaker (C-curve) may trip if multiple supplies power up simultaneously. Solutions: Use D-curve breakers (higher inrush tolerance), stagger power-up with relays, or install an inrush current limiter. One SPST240 per 10A C-curve breaker is usually fine. Two or more on the same circuit will trip.
Q: What’s the output adjustment range, and when would I change it?
A: 22–28V DC via the potentiometer under the front cover. Use 22V if your load is sensitive to overvoltage (some LED lights, sensitive sensors). Use 28V to compensate for voltage drop on long cable runs (100+ feet). Most applications stay at 24V. Measure at the load, not at the supply, when adjusting.
Q: How do I wire the DC OK relay output (if equipped on your variant)?
A: Some SPST240 units have a dry contact relay output (rated 30V DC / 1A). Terminals labeled “OK+ / OK-“. Contact closes when output voltage is above 21V. Wire this to a PLC digital input for remote monitoring. If your unit has no relay output, use the green LED or monitor output voltage directly with a PLC analog input.
Q: What’s the warranty, and does it cover damage from connected loads?
A: 1-year replacement warranty. Covers defects in materials and workmanship — failed capacitors, blown FETs, bad solder joints. Does NOT cover damage from external shorts, water ingress, reverse polarity on input, or overvoltage on input (e.g., feeding 480V AC into a 240V-rated supply). We test every SPST240 before shipping with a 10A resistive load for 30 minutes. Request test report.
Q: My SPST240 died after a lightning storm. Is that covered?
A: No. Surge damage is considered external cause. The SPST240 has basic surge protection (varistors), but direct or nearby lightning strikes exceed the rating. For lightning-prone sites, install external surge suppression (Type 1 or Type 2) upstream of the supply.
Q: Can I use the SPST240 outdoors or in washdown areas?
A: No. The SPST240 is IP20 rated — not waterproof or dust-tight. It requires installation in an enclosure rated for your environment (NEMA 4/4X for washdown, NEMA 3R for outdoor). Operating temperature range is -25 to +70°C. Below -25°C, the supply may not start. Use a space heater in the enclosure for cold climates.
