Hunter PSR-53 Pump Start Relay | Triple-Pole | 7.5HP 230V | 10HP 3-Phase (PSR-53)

High-Capacity Pump Protection: Hunter PSR-53 Triple-Pole Pump Start Relay

The Hunter PSR-53 is a triple-pole/single-throw (TPST) pump start relay designed for high-horsepower irrigation pump applications. With NEMA 3R weatherproof construction and universal 24 VAC input from any irrigation controller, the PSR-53 safely controls pumps up to 7.5 HP single-phase, 10 HP three-phase, or 3 HP at 120 VAC — the most capable relay in Hunter’s PSR lineup.

Key Specifications & Features

• SKU / UPC: PSR-53 (also: PSR53) / 0611698100059
• Configuration: Triple-pole, single-throw (TPST)
• Control Input: 24 VAC flying leads from irrigation controller
• HP at 120 VAC: Up to 3 HP (single-phase)
• HP at 230 VAC: Up to 7.5 HP (single-phase)
• HP at 230 VAC Three-Phase: Up to 10 HP
• Max Full Load Amps: 40A
• Max Resistive Amps: 50A
• Coil VA Inrush: 60 VA (2.50A)
• Coil VA Holding: 5 VA (0.21A)
• Enclosure: NEMA 3R — weatherproof, rust-resistant, lockable
• Dimensions: 7.5" H × 6.5" W × 4.5" D
• Certifications: UL approved contactor, IPX4 rating
• Warranty: 2 years

Frequently Asked Questions

What is the difference between the PSR-53 and PSR-52?
The PSR-52 is a double-pole relay for single-phase pumps up to 7.5 HP at 230V. The PSR-53 adds a third pole to support three-phase pump motors up to 10 HP — a requirement for large commercial irrigation systems with three-phase power service.

Why is a triple-pole relay needed for three-phase pumps?
Three-phase AC power uses three conductors. Each pole in a relay switches one conductor. A triple-pole relay simultaneously switches all three phases together, providing safe, synchronized motor control that is code-required for three-phase applications.

Is the PSR-53 compatible with all irrigation controllers?
Yes. The standard 24 VAC flying leads connect to any irrigation controller’s pump start terminal — Hunter, Rain Bird, Orbit, Toro, Rachio, and all others.