Monitoring Relay Siemens Three Phase 22.5mm Width Screw Terminal 2 CO

Description

Product Overview

The Siemens 3UG45111BP20 Monitoring Relay is engineered to provide precise three‑phase voltage insulation monitoring while occupying a minimal footprint of just 22.5 mm in width. Constructed from robust, fire‑rated housing materials, the relay endures the harsh conditions typical of industrial environments, including temperature fluctuations, vibration, and exposure to dust or chemicals. Its screw terminal design eliminates the need for specialized crimp tools, allowing installers to secure connections quickly and securely, reducing installation time and potential errors. The relay incorporates two CO (circuit open) contacts that open instantly when an insulation fault is detected, delivering a clear and immediate signal to downstream protective devices. This rapid response helps prevent damage to motors, drives, and other critical equipment, extending their service life and minimizing costly downtime. The device operates on a wide line supply range of 420–690 V, making it compatible with most three‑phase power systems worldwide. With a delay time adjustable to suit specific application requirements, the relay can be fine‑tuned to balance sensitivity and noise immunity, ensuring reliable operation even in electrically noisy environments. Detailed specifications such as dimensions (1.18 × 3.94 × 4.33 in), weight (3.2 oz), and compliance with IEC standards are documented in the product datasheet, providing engineers with the data needed for seamless integration into control panels, motor protection schemes, and safety circuits.

Usage

This monitoring relay is ideally suited for a broad range of industrial applications where continuous supervision of insulation integrity is critical. Typical installations include motor control centers, variable frequency drive (VFD) protection modules, and automated manufacturing lines that rely on three‑phase power distribution. In motor control centers, the relay monitors the insulation resistance of motor windings, alerting operators to early signs of degradation before catastrophic failures occur. For VFD systems, the relay safeguards the inverter circuitry by detecting insulation breakdowns that could otherwise lead to expensive repairs or safety hazards. The compact width of the device allows it to be mounted on densely packed DIN rails alongside other protective relays, making it an excellent choice for retrofits where space is at a premium. Additionally, the screw terminal connections simplify field wiring in remote or hard‑to‑reach locations, where time and tool availability are limited. The relay’s adjustable delay feature enables customization for applications ranging from high‑speed machinery that requires rapid fault detection to slower processes where a longer delay helps filter transient disturbances. By integrating the Siemens monitoring relay into your power safety strategy, you gain a reliable layer of protection that enhances overall system resilience and complies with occupational safety regulations.

Why Choose Us

Choosing Siemens as your partner means selecting a brand with a legacy of engineering excellence and a commitment to quality that spans more than a century. Every monitoring relay undergoes rigorous testing procedures, including high‑temperature endurance, mechanical shock, and electrical stress assessments, to verify that it meets or exceeds industry standards. Siemens provides comprehensive technical support, offering detailed installation manuals, wiring diagrams, and application notes that guide engineers through every stage of deployment. Our after‑sales service includes rapid response to warranty claims, access to genuine replacement parts, and a dedicated helpline staffed by experienced technicians who can troubleshoot complex issues. The 3UG45111BP20 model benefits from Siemens’ global supply chain, ensuring consistent availability and compatibility with a wide range of ancillary components such as circuit breakers, contactors, and programmable logic controllers (PLCs). Moreover, Siemens continuously invests in research and development, incorporating the latest advancements in sensor technology and digital communication to keep its products at the forefront of industrial automation. When you select this monitoring relay, you are not only acquiring a high‑performance device but also gaining a partnership that supports your operational goals, reduces total cost of ownership, and enhances safety across your entire electrical infrastructure.

Key Features

• Compact 22.5 mm width design maximizes panel space while delivering full three‑phase monitoring capability.
• Screw terminal connections simplify installation, reduce wiring errors, and eliminate the need for special tools.
• Two CO contacts provide immediate fault indication, enabling fast shutdown of affected equipment.
• Adjustable delay time allows customization for diverse applications, balancing sensitivity and noise immunity.
• Comprehensive after‑sales support from Siemens, including technical assistance, spare parts, and warranty coverage.

FAQ

What voltage range does the relay support?

The Siemens 3UG45111BP20 operates on a line supply voltage between 420 V and 690 V, making it compatible with most standard three‑phase industrial power systems worldwide.

Can the relay be used in environments with high electrical noise?

Yes. The device includes an adjustable delay feature that can be set to filter out transient disturbances, ensuring reliable operation even in electrically noisy settings such as near VFDs or large motor drives.

How does the screw terminal design improve installation?

Screw terminals allow technicians to secure wires directly without crimping or soldering, speeding up the wiring process, reducing the risk of loose connections, and simplifying maintenance or replacement tasks.

What is the purpose of the two CO contacts?

The two circuit‑open contacts open instantly when an insulation fault is detected, providing a clear signal to downstream protective devices or control systems, which can then initiate a safe shutdown or alarm.

Is the relay covered by a warranty?

Yes. Siemens offers a standard warranty period for the monitoring relay, and customers can access technical support and replacement parts throughout the warranty term, ensuring long‑term reliability.