Protection Relays

With a proven track record of 50 years, Microelettrica continues to lead the way making new protection, control, and automation applications possible.

From Generators to Transformers and through Transmission lines to Motors and beyond, our solutions detect anomalies and mitigate faults, preventing costly downtime and equipment damage to ensure dependable, safe power worldwide.

Explore Protection Relay Applications

All Protection Relay Series

RBW/D

Directional Overcurrent Definite Time
AF  32, 67, 67N

RBW/I

Directional Overcurrent Inverse Time
AF  32, 67, 67N

N-DIN-F

LV Feeder relay
F
AF  46, 49

MC0A

Earth-Fault relay
AF  50N/51N, 51BF, 86

MC20-CEI

CEI relay with Directional Earth-Fault
F
AF  67N
CEI-016

MC30

Feeder relay MC30
F
AF  49

MC30-R2

Feeder Relay with Autoreclosure
F
AF  49, 74TCS, 79

MC40-SEF2

Feeder Relay with Sensitive Earth-Fault and Autoreclosure
F
AF  49, 64SEF, 79

MC40-SR

Feeder relay MC40
F
AF  49

MC3V-CEI-021

CEI-021 relay
V
AF  51BF, 79
CEI-021

MC3V-CEI (A70)

CEI-016(A70) relay with autoreclosure
V
AF  51BF, 59N, 79, 81V
CEI-016(A70)

FMR

Complete Feeder relay
FF, VV
AF  51V, 74TCS

FMR-M

Complete Feeder/Motor relay
F, VV, M, Dir
AF  51V, 74TCS

RHS

Rotating Diode Failure relay
AF  RoD
PROTECTIVE FUNCTION PACKAGES
F   Standard Feeder (ANSI 50/51, 51BF, 50N/51N, 68, 86)
FF   Advanced Feeder (ANSI 46, 49, 50/51, 51BF, 50N/51N, 68, 79, 86)
V   Standard Voltage (ANSI 27, 59, 81, 68, 86)
VV   Advanced Voltage (ANSI 27, 27V1, 59, 59N, 59V2, 68, 81, 86)
M   Motor (ANSI 37, 46, 48, 49, 51LR, 64, 66, 68, 86)
Dir   Directional (ANSI 67, 67N)
AF   Additional Functions
Note: 68, 86 not present in N-DIN series
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LEGENDS

PROTECTIVE FUNCTION PACKAGES
F   Standard Feeder (ANSI 50/51, 51BF, 50N/51N, 68, 86)
FF   Advanced Feeder (ANSI 46, 49, 50/51, 51BF, 50N/51N, 68, 79, 86)
V   Standard Voltage (ANSI 27, 59, 81, 68, 86)
VV   Advanced Voltage (ANSI 27, 27V1, 59, 59N, 59V2, 68, 81, 86)
M   Motor (ANSI 37, 46, 48, 49, 51LR, 64, 66, 68, 86)
Dir   Directional (ANSI 67, 67N)
AF   Additional Functions
Note: 68, 86 not present in N-DIN series