ABB REX521 Feeder Protection Relay 100% Brand New
The ABB REX521 is a protection relay for ABB industrial automation platforms. Input impedance: <750 mΩ / <100 mΩ / <20 mΩ | Voltage inputs rated voltage: 100 V / 110 V / 115 V / 120 V (parametrization) | Sensor inputs voltage range RMS: 9.4 V RMS. Factory-sealed, tested on live rack with 48-hour burn-in. 12-month warranty. Ships within 24 hours from Shenzhen.
Everything You Need to Know About the 110/120/220/240 V (PS_87H only) REX521
What is this module? The REX521 is a protection relay designed for 110/120/220/240 V (PS_87H only) automation systems. rated frequency: 50.0/60.0 Hz; current inputs rated current: 0.2 A / 1 A / 5 A; input impedance: <750 mΩ / <100 mΩ / <20 mΩ; voltage inputs rated voltage: 100 V / 110 V / 115 V / 120 V (parametrization).
Is it genuine? Yes. Every 110/120/220/240 V (PS_87H only) module we sell is 100% genuine — not a clone, not a compatible replacement, not a refurb sold as new. Manufacturer serial numbers and holographic labels are intact. We provide full traceability documentation with every order.
How fast can I get it? We ship within 24 hours of confirmed payment from our Shenzhen warehouse via DHL Express, FedEx Priority, or UPS Worldwide Express. Typical delivery time is 3–5 business days to most destinations worldwide. Customs documentation is included.
What if it does not work? First, verify the module is installed in the correct chassis slot as configured in your system software. Slot mismatch is the #1 cause of modules that appear DOA but are actually configuration issues. If the module is confirmed defective, we ship an advance replacement immediately under our 12-month warranty — before we even receive the returned unit.
Do I need to buy more than one? For critical water treatment applications, we recommend N+1 sparing — one spare for every 3–5 installed modules. The carrying cost of a spare is negligible compared to even a few hours of unplanned downtime. Contact us for volume pricing on 5+ units.
Technical Specifications
| Rated frequency | 50.0/60.0 Hz |
|---|---|
| Current inputs Rated current | 0.2 A / 1 A / 5 A |
| Input impedance | <750 mΩ / <100 mΩ / <20 mΩ |
| Voltage inputs rated voltage | 100 V / 110 V / 115 V / 120 V (parametrization) |
| Sensor inputs voltage range RMS | 9.4 V RMS |
| Input voltage, AC | 110/120/220/240 V (PS_87H only) |
| Input voltage, DC | 110/125/220 V (PS_87H), 24/48/60 V (PS_87L) |
| Burden | <20 W |
| Ripple in DC auxiliary voltage | Max. 12% of the rated DC value (IEC 60255-11) |
| Internal overtemperature indication | +78°C (+75…+83°C) |
| Operating range, DC | 80…265 V DC |
| Manufacturer | ABB |
| Model / SKU | REX521 |
✓ Ships within 24 hours | ✓ 12-Month Warranty | ✓ Worldwide Delivery
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