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.
Differential Relay Hager HR420 Specifications
| Brand | Hager (Germany) |
|---|---|
| Model | HR420 |
| Net weight | Approx 120 g |
| Standard supply voltage | AC230V / AC110V 50Hz |
| 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 |
| 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 |
About the Differential Relay Hager HR420
The Hager (Germany) Differential Relay Hager HR420 is a electrical products used in industrial automation, control and power systems. It is rated at Brand Hager (Germany), Model HR420, Net weight Approx 120 g. Manufactured by Hager (Germany), this electrical products is supplied as new, original industrial-grade stock. Each unit is identified by manufacturer part number Differential Relay Hager HR420 for accurate procurement and cross-referencing.
Why source the Differential Relay Hager HR420 from HDE123
- Verified part number: every Differential Relay Hager HR420 is checked against its manufacturer specification before shipment.
- 11 confirmed technical parameters available on this page for engineering review.
- Global delivery with clear lead time and commercial invoice for B2B buyers.
- Fast B2B support: send us the equipment model or an existing part number and our engineers confirm compatibility before you order.
Ordering the Differential Relay Hager HR420
To order the Hager (Germany) Differential Relay Hager HR420, add it to your cart and complete checkout, or use the Request a Quote form for volume purchases and replacement / cross-reference enquiries. Lead time: typically 3–10 working days for in-stock items, subject to confirmation. Worldwide shipping is available and a commercial invoice is provided for customs.