Brand: K-Rain SKU: 1553
Product Overview
The K-Rain 1553 is a three-phase pump start relay with a 24 VAC control coil. It allows a compatible irrigation controller to energize the relay from a low-voltage pump-start output while triple-pole contacts switch the pump's separate three-phase power circuit.
K-Rain rates the 1553 for compatible three-phase pump loads up to 3 horsepower at 120 VAC and up to 10 horsepower at 240 VAC. The relay uses triple-pole, single-throw contacts with a 40-amp inductive and 50-amp resistive rating. The 24 VAC coil signal and the motor supply are separate circuits; the controller energizes only the coil and does not provide power to the pump.
The relay is installed in a Type 3R rainproof enclosure with accessible terminals. Three-phase pump systems require careful verification of voltage, phase, horsepower, full-load current, starting current, rotation, control voltage, conductor sizing, grounding, disconnecting means, overload protection, and branch-circuit protection. The relay itself does not replace a code-required motor starter or overload device. Installation and service should be completed by a qualified electrician familiar with three-phase motor controls and the current K-Rain instructions.
Key Features
- 24 VAC, 60 Hz control coil
- Triple-pole, single-throw relay
- Designed for compatible three-phase pump operation
- Up to 3 HP at 120 VAC
- Up to 10 HP at 240 VAC
- 40-amp inductive and 50-amp resistive ratings
- Type 3R rainproof enclosure
Common Uses
- Starting a compatible three-phase irrigation pump from a 24 VAC controller
- Replacing an exact K-Rain 1553 relay
- Separating low-voltage control wiring from three-phase motor power
Compatibility and Installation Notes
- Use only with a verified three-phase pump and electrical design.
- Confirm the controller can energize the 24 VAC coil.
- Verify all three motor conductors, phase sequence, and protective devices.
- Do not substitute a double-pole single-phase relay.
- Disconnect and lock out every power source before service.
Frequently Asked Questions
Is the K-Rain 1553 a single-phase relay?
No. It is a triple-pole relay intended for compatible three-phase operation.
What are the listed horsepower ratings?
K-Rain lists up to 3 HP at 120 VAC and up to 10 HP at 240 VAC for compatible three-phase installations.
Does the controller power the pump through its 24V output?
No. The controller's 24 VAC signal energizes the coil; the relay switches a separate three-phase motor circuit.
Why Buy This K-Rain 1553 from Big Frog Supply?
Big Frog Supply identifies the 1553 as the three-phase, triple-pole, 24V-coil model and distinguishes it from the single-phase 1551 and 1552, which is essential when matching pump phase and horsepower.
Product Type Three-phase pump start relay
Manufacturer Part Number 1553
Control Coil 24 VAC, 60 Hz
Contact Configuration Triple pole, single throw
Operation Three phase
Pump Load Rating Up to 3 HP at 120 VAC; up to 10 HP at 240 VAC
Inductive Contact Rating 40 A
Resistive Contact Rating 50 A
Coil Inrush 60 VA
Coil Sealed 7 VA, 2.7 W per current product specification brochure
Enclosure Type 3R rainproof
