50-LP-AC10 — LatchPac Solid State Latching Relay — 5-Pack
Latching solid state AC relay, 24–240 VAC, 10 A, 40 A inrush
The 50-LP-AC10 LatchPac is in development and pricing has not yet been determined. Contact us for availability and pre-order information.
| Switching mode | DP latching |
| Voltage range | 24 – 240 VAC, 50–60 Hz |
| Maximum load | 10 A |
| Maximum inrush | 40 A |
| Maximum surge | 15 A |
| Sensor circuit resistance | 1000 ohms max |
| Input sense voltage | 5 VDC |
| Dissipation | 32 watts per amp switched |
| Heat sink required above | 0.75 A |
| Base isolation | 1000 VDC |
| Dimensions | 2.43″ × 1.600″ × 0.97″ (61.72 × 40.64 × 24.57 mm) |
| Ambient temperature | 0 – 140 °F at 100% duty cycle |
| Terminals | Eurostyle® screw type |
| Compliance | RoHS compliant |
Product Description
The 50-LP-AC10 LatchPac is a solid state latching relay built for wide-differential level control. Where the NistorPac follows its sensor directly, the LatchPac latches: it stays on after the starting sensor releases, and stays on until a second sensor unlatches it. That is what makes pump-down and pump-up control possible from two ERECTA SWITCH sensors — without a PLC or a logic controller.
How the latch works
Load connects to terminals E and F and line voltage to G and H, leaving the relay in standby, poised to switch. The start switch connects to terminals A and B; the stop switch to C and D. Control is accomplished when both switches are closed — the circuit turns on and stays on until both switches are open. For Start Low / Stop High, configure both sensors to open on rise; for Start High / Stop Low, configure both to close on rise.
The result is a wide differential between the start and stop levels, which is what eliminates the short-cycling and contact chatter you get when a single sensor sits near its trip point. Because the latch holds, brief signal disruptions and sensor bounce do not interrupt the load.
Wiring and heat
Eurostyle® screw terminal blocks accept two wires from the voltage source, two from the load, two from the start sensor and two from the stop sensor; optional ferrules simplify the terminal blocks. Use AWG 20 minimum for sensor circuits and AWG 18 minimum for line and load. A heat sink is required above 0.75 A continuous. The relay carries 1000 VDC base isolation between the sensor circuit and the load, and operates at 100% duty cycle across 0–140 °F.
Where it is used
Sump pump control from high and low level sensors, tank fill and drain sequencing, overflow protection in rinse stations and chemical tanks, backup pump control in flood response systems, dual-float logic for IBC totes and storage tanks, and valve sequencing in fluid processing. Any application with long cycle times or widely spaced setpoints benefits from the latch. It accepts any passive SPST switch meeting the 5 VDC input sense and 1000 ohm maximum sensor resistance — including Series 10 and Series 20 float switches.