Brand: K-Rain SKU: 1551
Product Overview
The K-Rain 1551 is a higher-capacity pump start relay with a 120 VAC control coil. It allows a compatible line-voltage controller or timer output to energize the relay while the relay contacts switch the pump's separate power circuit. This keeps the pump's motor current out of the controller.
K-Rain rates the 1551 for compatible pump loads up to 3 horsepower at 120 VAC and up to 5 horsepower at 240 VAC. The relay uses double-pole, single-throw contacts with current capacity intended for the larger load range. Its 120 VAC coil must be matched to the controller's control output; it is not intended to connect directly to a standard 24 VAC pump-start terminal.
The rainproof Type 3R enclosure provides a protected, accessible wiring location. Before ordering, verify the controller signal voltage, motor supply voltage, phase, horsepower, full-load and starting current, conductor size, control method, grounding, disconnect, and circuit protection. The enclosure does not replace required motor overload protection or a code-required starter. Because the relay switches hazardous line voltage, installation and service should be completed by a qualified professional using current K-Rain instructions and applicable codes.
Key Features
- 120 VAC, 60 Hz control coil
- Double-pole, single-throw contacts
- Up to 3 HP at 120 VAC
- Up to 5 HP at 240 VAC
- 40-amp inductive and 50-amp resistive contact ratings
- Rainproof Type 3R enclosure
Common Uses
- Starting a higher-capacity irrigation pump from a 120V control signal
- Replacing a matching K-Rain 1551 relay
- Separating controller circuitry from pump motor current
Compatibility and Installation Notes
- The controller or timer must provide the correct 120 VAC coil signal.
- Do not connect the coil to a standard 24 VAC controller output.
- Confirm pump load remains within both HP and amperage ratings.
- This is not a three-phase pump relay.
- Disconnect all power and follow K-Rain's wiring instructions.
Frequently Asked Questions
Can the 1551 work with a 24V irrigation controller?
Not directly. Its coil requires 120 VAC. The 1552 is the related high-capacity model with a 24 VAC coil.
What pump sizes are listed?
K-Rain lists up to 3 HP at 120 VAC and up to 5 HP at 240 VAC for compatible installations.
Does it provide motor overload protection?
No. Use all starters, overloads, fuses, breakers, and disconnects required by the motor and local code.
Why Buy This K-Rain 1551 from Big Frog Supply?
Big Frog Supply distinguishes the 1551's 120V coil from the 24V-coil 1552 while clearly listing the different 120V and 240V horsepower limits, helping contractors match all three electrical factors.
Product Type Higher-capacity pump start relay
Manufacturer Part Number 1551
Control Coil 120 VAC, 60 Hz
Contact Configuration Double pole, single throw
Pump Load Rating Up to 3 HP at 120 VAC; up to 5 HP at 240 VAC
Inductive Contact Rating 40 A
Resistive Contact Rating 50 A
Coil Inrush 77 VA per current product specification brochure
Coil Sealed 10 VA, 4 W per current product specification brochure
Enclosure Type 3R rainproof
Three-Phase Operation No
