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

N-DIN-016

LV relay for CEI-016
F
CEI-016

N-DIN-F

LV Feeder relay
F
AF  46, 49

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

FMR-M

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