Schneider Electric REL52016 Universal Protection Relay

Product Overview

The REL52016 universal protection relay from Schneider Electric is part of the PowerLogic P3U series. It provides reliable protection for buildings, industrial facilities, utilities, and large processes. Moreover, it combines user-friendly operation with robust performance, ensuring safety and efficiency. Additionally, the relay supports modular expansion for advanced system integration.

Power Supply and Input Capabilities

This relay operates on a wide 48–230 V AC/DC supply. Furthermore, it integrates multiple protections, including overcurrent, overload, earth fault, and breaker failure according to ANSI standards. In addition, it supports 3-phase CT inputs, one residual current input, and 4 voltage transformer inputs. Consequently, it delivers precise monitoring and protection in complex electrical installations.

Interface and Communication Features

The front interface includes an LCD display with a single-line diagram and two customizable keys. Additionally, it supports a front USB port and a rear RS485 port, enabling IEC 60870-5, DNP3, Modbus RTU, DeviceNet, and SPAbus communications. Moreover, the device is compatible with EcoStruxure Power Device software and Easergy Pro setup. As a result, operators gain real-time monitoring and simplified control over switchgear operations.

Protection Functions

The REL52016 provides comprehensive ANSI-based protection, including phase overcurrent (50/51), directional overcurrent (67), earth fault overcurrent (50N/51N), and directional earth fault (67N). Additionally, it features transient earth fault (67NI), broken conductor detection (46 I2/I1), switch ON to fault (SOTF), and breaker failure (50BF). Furthermore, it supports undervoltage (27), overvoltage (59), underfrequency (81/81N), rate of change of frequency (81R), synchro-check (25), and lockout relay (86).

Measurement and Monitoring Capabilities

The relay measures 3-phase, zero, positive, and negative sequence currents. Additionally, it monitors voltage phase-to-phase, phase-to-earth, zero, positive, and negative sequence. Moreover, it tracks frequency, active/reactive/apparent power, energy, and power factor. It also evaluates current and voltage harmonics (2nd–15th) with THD, short-circuit fault reactance, and earth fault reactance. Consequently, operators can detect anomalies early and take corrective actions efficiently.

Technical Specifications

Parameter	Specification
Range	PowerLogic P3U
Mounting case size	30TE
Power supply	48–230 V AC/DC
CT inputs	3 × 1/5 A phase, 1 × 1/5 A residual
VT inputs	4 × 100/110 V
Digital Inputs	16
Digital Outputs	8 + 1 watchdog
Analog Inputs	0
Analog Outputs	0
Communication	USB front, RS485 rear
Protocols	IEC 60870-5-101/103, DNP3, Modbus RTU, DeviceNet, SPAbus
Display	LCD 128×64 pixels, 2 keys
Weight	2.5 kg (5.5 lb)
Dimensions	H: 169.5 mm, W: 170 mm, D: 205 mm
Protection	ANSI functions 50/51, 50N/51N, 67, 67N, 46, 50BF, 37P, 79, 27, 59, 81R, etc.
IP rating	IP54
Operating temp	-40…65 °C
EMC	EN 60255-26, CISPR 11/22, IEC/EN 61000 series
Warranty	Standard 2 years, up to 10 years extended