Overview
The ABB 437P4671 Type 32R Circuit Shield Reverse Power Relay is an electromechanical protection device engineered to detect and respond to reverse power flow in electrical circuits. This relay prevents equipment damage and maintains system integrity by interrupting reverse current conditions before they cause operational failures. Common in utility, generation, and industrial power systems, the 437P4671 offers reliable, field-proven performance with adjustable sensitivity settings.
Key Features
- Type 32R Circuit Shield design for proven protection
- Adjustable pickup sensitivity for application flexibility
- Electromechanical construction for reliability and simplicity
- Compact form factor suitable for panel mounting
- Control voltage flexibility (available in AC and DC versions)
Technical Specifications
Specifications vary by specific version (control voltage and frequency). The relay type accommodates both VAC and VDC control inputs with adjustable trip points. Standard configurations include 120V 60Hz, 120V 50Hz, and 48/125 VDC control options. The device is designed for applications requiring 50/60Hz frequency compatibility depending on model variant.
Typical Applications
- Generator Protection: Prevents back-feed into utility lines
- Parallel Generation: Protects against reverse power in multi-source systems
- Power System Synchronization: Ensures unidirectional power flow control
- Industrial Motor Control: Prevents motor acting as generator and feeding back to line
- Utility Distribution: Protects feeder circuits in utility substations
Compatibility & Replacements
The ABB 437P4671 is part of ABB’s Type 32R Circuit Shield relay family. Related models in this product line include the 437P4661, 437W4690, 437W4790, and 437W4890, each configured for different voltage and power rating requirements. When sourcing replacements or upgrades, verify the control voltage, frequency (50/60Hz), and power rating match your application requirements. This unit is direct-compatible with legacy ABB/Asea Brown Boveri installations using the same mounting footprint and terminal configuration.
