Product Description

🔹 Earth Leakage Relay, 1Ph-2W / 3Ph-3W / 3Ph-4W, 230V AC – 7UG0841-1CC20

Product Description

The Siemens 7UG0842-1CD20 is a SIRIUS Digital Earth Leakage Monitoring Relay designed for monitoring earth leakage current in 1-phase 2-wire, 3-phase 3-wire and 3-phase 4-wire electrical systems. The relay operates with a 230 V AC supply, features a compact 35 mm module width, and provides 2 × 1 changeover (CO) contacts for alarm and control applications.

This Siemens digital earth leakage relay is designed to work with a suitable core balance current transformer (CBCT) for detecting residual or leakage current in electrical circuits. It can be used in industrial control panels, distribution systems, motor feeders, automation equipment and electrical protection applications.

The compact design makes the 7UG0842-1CD20 suitable for space-conscious electrical panels where continuous earth leakage monitoring is required. Siemens lists this model as an active product (PM300) with a net weight of approximately 0.207 kg.

Key Features

• Brand: Siemens

• Product Family: SIRIUS 7UG

• Part Number: 7UG0842-1CD20

• Product Type: Digital Earth Leakage Monitoring Relay

• Monitoring Function: Earth Leakage Monitoring

• System Type: 1-Phase 2-Wire

• System Type: 3-Phase 3-Wire

• System Type: 3-Phase 4-Wire

• Supply Voltage: 230 V AC

• Output Contacts: 2 × 1 CO

• Contact Type: Changeover Contact

• Module Width: 35 mm

• Compatible Sensor: Core Balance Current Transformer

• CBCT Series: Siemens 7UG0996 / 7UG0997 / 7UG0999 / 7UG0994 / 7UG0995

• Product Lifecycle: PM300 – Active Product

• Net Weight: Approx. 0.207 kg

• Application: Earth Leakage Monitoring

• Mounting: Control Panel / DIN-Rail Applications

• Product Range: Siemens SIRIUS Monitoring Relays

Applications

The Siemens 7UG0842-1CD20 earth leakage monitoring relay is suitable for:

• Earth leakage monitoring

• Earth fault monitoring

• Industrial electrical panels

• Motor control panels

• Power distribution systems

• Distribution boards

• Industrial automation systems

• Machine control panels

• Electrical control cabinets

• Motor feeders

• Transformer feeders

• Generator systems

• Pump control panels

• Industrial machinery

• Factory automation

• Electrical maintenance systems

• Power monitoring applications

• Industrial protection systems

Benefits

• Digital earth leakage monitoring

• Supports 1-phase 2-wire systems

• Supports 3-phase 3-wire systems

• Supports 3-phase 4-wire systems

• 230 V AC operating supply

• Compact 35 mm module design

• Two changeover output contacts

• Suitable for CBCT-based earth leakage detection

• Useful for continuous electrical system monitoring

• Suitable for industrial automation applications

• Helps identify abnormal leakage-current conditions

• Suitable for control and alarm circuits

• Space-saving panel installation

• Genuine Siemens SIRIUS monitoring component

• Suitable for OEM and maintenance applications

High-Level SEO Keywords

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Frequently Asked Questions

Q1. What is Siemens 7UG0842-1CD20?
The 7UG0842-1CD20 is a Siemens SIRIUS digital earth leakage monitoring relay used for monitoring leakage current in electrical systems.

Q2. Which electrical systems are supported?
It supports 1-phase 2-wire, 3-phase 3-wire and 3-phase 4-wire systems.

Q3. What is the supply voltage of 7UG0842-1CD20?
The relay operates with a 230 V AC supply.

Q4. How many output contacts does it have?
The device provides 2 × 1 CO, meaning two changeover contacts.

Q5. What is the module width?
The Siemens 7UG0842-1CD20 has a compact 35 mm module width.

Q6. What is the function of this relay?
Its primary function is to monitor earth leakage/residual current and provide relay outputs for associated alarm or control functions.

Q7. Does the relay require a CBCT?
Yes, the earth leakage monitoring system uses a compatible core balance current transformer (CBCT) to detect residual current. Siemens lists dedicated 7UG099x CBCTs for the earth leakage relay family.

Q8. Where is 7UG0842-1CD20 commonly used?
It can be used in industrial control panels, motor feeders, distribution systems, automation equipment, machine panels and electrical monitoring applications.

Q9. Is 7UG0842-1CD20 a circuit breaker?
No. It is a digital monitoring relay. It detects earth leakage conditions and provides relay outputs; it is not itself a circuit breaker.

Q10. Is Siemens 7UG0842-1CD20 an active product?
Yes. Siemens Industry Mall information identifies the product lifecycle as PM300: Active Product.