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.

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All Protection Relay Series

DTMR3-TX

3-winding Transformer Differential relay
ANSI  50/51, 50N/51N, 51BF, 68, 74TCS, 86, 87T

DTMR

2-winding Transformer Differential relay with Restricted Earth-Fault
ANSI  50/51, 50N/51N, 51BF, 68, 74TCS, 86, 87N, 87T

RBW/D

Directional Overcurrent Definite Time
ANSI  32, 67, 67N

RBW/I

Directional Overcurrent Inverse Time
ANSI  32, 67, 67N

N-DIN-016

LV relay for CEI-016
ANSI  50/51, 50N/51N, 51BF, 68, 86
CEI-016

N-DIN-F

LV Feeder relay
ANSI  46, 49, 50/51, 50N/51N, 51BF, 68, 86

N-DIN-M

LV Motor relay
ANSI  26, 37, 46, 48, 49, 50/51, 51LR, 64, 66, 68, 86

MC0A

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

MC20

Basic Feeder Relay
ANSI  50/51, 50N/51N, 51BF, 68, 86

MC20-CEI

CEI relay with Directional Earth-Fault
ANSI  50/51, 50N/51N, 51BF, 67N, 68, 86
CEI-016

MC20-016

CEI-016 relay
ANSI  50/51, 50N/51N, 51BF, 68, 86
CEI-016

MC30

Feeder relay MC30
ANSI  49, 50/51, 50N/51N, 51BF, 68, 86

MC30-R2

Feeder Relay with Autoreclosure
ANSI  49, 50/51, 50N/51N, 51BF, 68, 74TCS, 79, 86

MC40-SEF2

Feeder Relay with Sensitive Earth-Fault and Autoreclosure
ANSI  49, 50/51, 50N/51N, 51BF, 64SEF, 68, 79, 86

MC40-SR

Feeder relay MC40
ANSI  49, 50/51, 50N/51N, 51BF, 68, 86

MC1V

Voltage single-phase relay
ANSI  27, 59, 68, 81, 86

MC2-30M

Motor relay
ANSI  37, 46, 48, 49, 50/51, 51BF, 51LR, 64, 66, 68, 74TCS, 86

MC2-30V

Voltage relay with ROCOF
ANSI  27, 59, 59N, 68, 74TCS, 81, 81R, 81V, 86

MC2-30T

Advanced Feeder relay
ANSI  46, 49, 50/51, 50N/51N, 51BF, 68, 74TCS, 79, 86

MC2-30MW

Motor relay with Voltage and Power control
ANSI  27, 37, 46, 48, 49, 50/51, 51BF, 51LR, 55, 59, 64, 66, 68, 74TCS, 81, 86

MC3V

Voltage three-phase relay
ANSI  27, 27V1, 59, 59N, 59V2, 68, 81, 86

MC3V-CEI-021

CEI-021 relay
ANSI  27, 51BF, 59, 68, 79, 81, 86
CEI-021

MC3V-CEI (A70)

CEI-016(A70) relay with autoreclosure
ANSI  27, 51BF, 59, 59N, 68, 79, 81, 81V, 86
CEI-016(A70)

FMR

Complete Feeder relay
ANSI  27, 27V1, 46, 49, 50/51, 50N/51N, 51BF, 51V, 59, 59N, 59V2, 68, 74TCS, 79, 81, 86

FMR-M

Complete Feeder/Motor relay
ANSI  27, 27V1, 37, 46, 48, 49, 50/51, 50N/51N, 51BF, 51LR, 51V, 59, 59N, 59V2, 64, 66, 67, 67N, 68, 74TCS, 81, 86

RHS

Rotating Diode Failure relay
ANSI  RoD

UB0/CR-D

Rotor Earth-Fault Relay
ANSI  64R