50-NP-AC5 — NistorPac Solid State Relay — 5-Pack
Non-latching solid state AC relay, 24–240 VAC, 5 A with heat sink
| Quantity | Price |
|---|---|
| 1–2 | $190.95 |
| 3–4 | $183.05 |
| 5–9 | $171.84 |
| 10–19 | $152.75 |
| 20+ | $124.12 |
| Switching mode | S.P.S.T., normally open |
| Voltage range | 24 – 240 VAC, 50–60 Hz |
| Load rating — no heat sink | 0.75 A (inductive / tungsten / resistive) |
| Load rating — with heat sink | 5.0 A |
| Maximum surge | 15 A |
| Minimum load | 0.1 A |
| Sensor circuit resistance | 300 ohms max (other than load) |
| Sensor current | 2 mA typical |
| Voltage loss | 2 VAC typical |
| Leakage through load terminal | < 6 mA |
| Power dissipation | 0.92 watt per amp switched |
| Dimensions | 1.500″ × 1.500″ × 0.955″ (38.10 × 38.10 × 24.25 mm) |
| Ambient temperature | 0 – 120 °F |
| Terminals | Eurostyle® screw type |
| Compliance | RoHS compliant |
Product Description
The 50-NP-AC5 NistorPac is a solid state AC switching relay designed expressly for OEM use. Reed switch sensors deliver a reliable, low-power contact closure but cannot directly drive pump motors, solenoids or high-current loads. The NistorPac bridges that gap: the sensor pilots the relay, and the relay switches the load. In other words it lets a reed switch sensor handle a bigger job than it can do by itself.
It has no moving parts, so it is silent, cannot suffer contact wear, and does not arc. It is a continuously powered device: in standby it draws a tiny amount of current — typically less than 0.001 A. When the sensor closes, supply voltage is switched through to the lamp, solenoid or motor, and the load stays on for exactly as long as the sensor circuit is complete.
Wiring
Eurostyle® screw terminals accept two wires from the voltage source, two from the load device and two from the sensor. Load connects to terminals A and F, line voltage to B and E, and the sensor to C and D. Control of the load is accomplished simply by completing and interrupting the sensor circuit between C and D. Optional wiring ferrules (50-BP-F series) make terminal block wiring easier. Use AWG 20 minimum for sensor circuits and AWG 18 minimum for line and load circuits, and fuse line and load circuits to the applicable equipment codes.
Heat management
NistorPacs dissipate roughly 0.92 watts per amp switched, and only while the load is on. Below 0.76 A the built-in heat sink is sufficient. Above that the relay must be attached to a supplemental heat sink or any cool metal surface of sufficient area to keep it from overheating — single-side area in square inches is (amps × 1.25)² on 1/16″ aluminium, with silicone grease at the interface. Mount away from high-heat sources and allow airflow in tight enclosures.
What you can drive it with
Any dry contact or passive SPST sensor will pilot a NistorPac — reed switches, float switches, bimetallic temperature switches, flow switches, magnetic contacts, thermostats and pressure switches. That makes it useful well beyond liquid level: thermal shutdown interlocks that cut power to a heating element on over-temperature, door and panel interlocks, pressure-triggered compressor or alarm stages, flow verification circuits, HVAC damper and blower control, and light-duty feeders or mixers driven from a simple contact closure.