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

DTMR3-TX

3-winding Transformer Differential relay
F
AF  74TCS, 87T

DTMR

2-winding Transformer Differential relay with Restricted Earth-Fault
F
AF  74TCS, 87N, 87T

RBW/D

Directional Overcurrent Definite Time
AF  32, 67, 67N

RBW/I

Directional Overcurrent Inverse Time
AF  32, 67, 67N

N-DIN-016

LV relay for CEI-016
F
CEI-016

N-DIN-F

LV Feeder relay
F
AF  46, 49

N-DIN-FEN

Basic LV Grid relay
F

N-DIN-M

LV Motor relay
M
AF  26, 50/51

MC0A

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

MC20

Basic Feeder Relay
F

MC20-CEI

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

MC20-016

CEI-016 relay
F
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

MC1V

Voltage single-phase relay
V

MC2-30M

Motor relay
M
AF  50/51, 51BF, 74TCS

MC2-30V

Voltage relay with ROCOF
V
AF  59N, 74TCS, 81R, 81V

MC2-30T

Advanced Feeder relay
FF
AF  74TCS

MC2-30MW

Motor relay with Voltage and Power control
V, M
AF  50/51, 51BF, 55, 74TCS

MC3V

Voltage three-phase relay
VV

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

FMR-Ts

Complete Feeder relay with Touchscreen HMI
FF, VV
AF  51V, 74TCS

RHS

Rotating Diode Failure relay
AF  RoD

UB0/CR-D

Rotor Earth-Fault Relay
AF  64R
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
Start typing to see products you are looking for.

FILTERS

Filters

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