Capacitor Start/Induction Run Submersible Motor Control, 1/2 hp

SMC-IR0521-01 Submersible Motor Control – 1/2 HP, 230V, NEMA 3R Rated

The Myers SMC-IR0521-01 submersible motor control is engineered for consistent and safe operation of 3-wire 1/2 HP submersible motors. It features heavy-duty components and weather-resistant construction, making it a dependable choice for both residential well systems and commercial-grade installations.

Designed for long-term use in demanding environments, this control box ensures reliable motor startup and protection with integral overload reset access, robust relay mechanisms, and corrosion-resistant hardware.

Performance Features

• ✅ NEMA 3R Steel Enclosure – Rated for outdoor and indoor installation; protects internal components from weather and site contaminants.
• ✅ HardBond™ Finish – Industrial-grade coating provides up to 5x the corrosion resistance of conventional finishes.
• ✅ Factory-Wired High-Load Relay – Supports consistent motor engagement under high-load conditions.
• ✅ Heavy-Duty Contactor Points – Designed for frequent cycling with minimal wear.
• ✅ External Overload Reset – Allows reset access without removing the cover, improving serviceability in field conditions.
• ✅ Multiple Electrical Knockouts – Includes top and bottom knockouts to simplify installation routing options.
• ✅ Terminal Blocks Rated for #4 AWG – Supports robust wiring connections using large-gauge cable for power transmission.
• ✅ Internal Wiring Schematic – Permanently affixed inside cover to assist with accurate and code-compliant hookup.

Electrical & Dimensional Specifications

• Motor Compatibility: 3-wire, 1/2 HP submersible motor (230V)
• Operating Voltage: 230 VAC, single-phase
• Frequency: 60 Hz
• Enclosure Size: 4.9" W x 2.8" D x 8.5" H
• Enclosure Rating: NEMA 3R steel cabinet
• Warranty: 1-Year Limited Manufacturer Warranty

Installation Overview

This control box is built for permanent mount on wall or backboard adjacent to pressure switch or pump panel. Installation should only be performed by licensed personnel in accordance with NEC and local code. Unit must be grounded and protected by a properly sized breaker or fuse.

Ensure line voltage is confirmed prior to energizing the control box. Field wiring should be verified against the provided internal schematic and include correct motor leads for start and run windings.

Application Suitability

Compatible with deep well applications, irrigation systems, and pressure-boosted potable water systems where a 1/2 HP 3-wire motor is installed. Frequently used in tandem with STA-RITE, Pentek, and Myers-branded motor assemblies across agricultural, residential, and small commercial systems.