Overview
The Struthers Dunn 425BXX is a heavy-duty industrial power relay designed for reliable switching in HVAC, motor control, and manufacturing applications. This relay series is available in multiple coil voltage options—including 120VAC, 240VAC, and 24VDC configurations—and is rated for continuous 30A switching capacity at rated voltages. As a proven legacy component manufactured by a company with over 100 years of industrial controls expertise, the 425BXX remains a trusted choice for maintenance and retrofit applications where drop-in compatibility is required.
Key Features
- 30A continuous switching capacity across rated voltage range
- Multiple coil voltage options: 120VAC, 240VAC, 24VDC, and 110VAC versions available
- 1 HP rated output suitable for motor control applications
- 50-60Hz compatible for North American industrial power systems
- Screw-terminal and flange-mount configurations available
- DPST-NO and Form A relay contact configurations
Technical Specifications
- Manufacturer: Struthers-Dunn Inc
- Part Number: 425BXX (multiple suffix options: -120AC, -240VAC, -24DC, etc.)
- Rated Current: 30A continuous
- Horsepower Rating: 1 HP
- Coil Voltage Options: 120VAC, 240VAC, 24VDC, 110VAC
- Frequency: 50-60Hz (AC models)
- Contact Configuration: DPST-NO (Form A available)
- Mounting: Screw terminal and flange mount options
- Industry Classification: Industrial Power Relay / General Purpose Contactor
Typical Applications
The 425BXX relay is commonly used in:
- Motor control circuits and starter applications
- Heating and air conditioning (HVAC) equipment control
- Manufacturing machinery and industrial automation
- Lighting control and load switching
- Legacy panel retrofit and modernization projects
- Compressor and pump motor protection circuits
Compatibility & Replacements
Compatible With
- Standard industrial 120/240VAC power distribution systems
- 24VDC low-voltage control circuits
- HVAC and motor control panels
- DIN rail and panel-mount control assemblies
- Single and three-phase motor starter circuits
Replaces / Drop-In Replacement For
The 425BXX series is a direct replacement for earlier Struthers-Dunn relay models in similar power ratings and pinout configurations. Verify your legacy system’s exact pin configuration and coil voltage before ordering to ensure drop-in compatibility.
Works With
- Definite-purpose contactor assemblies
- General-purpose relay sockets and holders
- Standard DIN 43650 and IEC control panel layouts
- Thermal overload relays and auxiliary contacts in starter circuits
- 24VDC pilot-controlled switching circuits
