Differential Relay Hager HR420

Hager HR420 Residual Current Differential Relay (Earth Fault Relay)
1. Basic Information
Brand: Hager (Germany)
Model: HR420
Product type: Modular DIN rail mounted differential earth leakage relay, matched with external zero-sequence current transformer (toroid)
Net weight: Approx 120 g
Standard supply voltage: AC230V / AC110V 50Hz
2. Core Technical Parameters
Adjustable leakage sensitivity: 30mA / 100mA / 300mA / 1A / 3A multi-grade selection
Trip delay mode: Instantaneous trip / 0.13s / 0.3s / 1s / 3s adjustable delay
Output contact: 1 group SPDT change-over contact, contact capacity 250VAC / 5A
Functional buttons: Front panel Test button (simulate fault trip), Reset latching button (fault state locking, manual reset required after action)
Indication: Power running green LED, fault red alarm LED
Working temperature range: -10℃ ~ +55℃; storage temperature: -40℃ ~ +70℃
Protection grade: IP20 (for indoor cabinet installation)
Wiring specification: Terminal wire range 1.5 ~ 4mm² rigid cable
3. Product Features
Latching fault output state, maintain alarm signal after leakage action until manual reset or power off
Sealable setting cover to avoid arbitrary parameter tampering on site
Wide matching range for toroidal transformers, applicable for main circuit current 15A ~ 4000A
Strong anti-electromagnetic interference, stable operation in industrial power distribution cabinets
Compact modular design, occupies only 2 standard DIN module widths
4. Application Scenarios
Earth leakage & electric shock protection for low-voltage power distribution systems (380V~690V); cooperate with circuit breaker shunt release to realize power-off protection, widely used in factory workshops, pumping stations, industrial equipment power cabinets, commercial building power distribution systems.
Purchase Inquiry Template
Quote original Hager differential relay HR420, multi-level adjustable sensitivity and trip delay, DIN rail installation with test & reset function. Provide genuine physical pictures, official datasheet, unit price and delivery lead time.