ABB PR120/DC DC Electronic Trip Unit

Overview

The ABB PR120/DC is a DC electronic trip unit designed for ABB SACE Emax DC air circuit breakers. The ABB PR120/DC provides reliable current protection and measurement functions for DC power systems. Built with dedicated DC sensing technology, the ABB PR120/DC supports accurate overload and short-circuit protection for DC circuits. It can be matched with Emax DC breakers to form a complete DC protection solution for new energy and industrial DC power systems.

Features

The ABB PR120/DC adopts dedicated DC current sensing design for stable detection in DC networks. It supports adjustable overload protection and short-circuit protection parameters to meet different load requirements. The ABB PR120/DC integrates basic current measurement and fault recording functions for on-site troubleshooting. It has good anti-interference performance and adapts to harsh electrical environments of DC power distribution. The ABB PR120/DC features plug-in installation and convenient parameter setting with supporting configuration tools.

Specs

Device Type: DC electronic trip unit Model: ABB PR120/DCMatching Breaker: ABB SACE Emax DC air circuit breaker Protection Functions: Overload protection, short-circuit protection Measuring Function: DC current monitoring Installation Form: Plug-in type Applicable System: Low voltage DC power system

Principle

The ABB PR120/DC collects DC current signals through built-in special current sensors. The internal processing circuit compares the sampled current value with preset protection thresholds. When the current exceeds the set limit, the ABB PR120/DC outputs a trip command to drive the circuit breaker to open and cut off the fault circuit. It records fault information synchronously for later inspection and analysis.

Applications

The ABB PR120/DC is widely used for protection of photovoltaic DC combiner cabinets and DC power distribution systems. It serves DC power supply loops in data centers and industrial DC equipment. The ABB PR120/DC applies to marine DC power distribution and energy storage battery cabinet protection. It also supports DC load protection for new energy power stations.