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3-Phase monitoring relay MXP-20

Description

A relay for monitoring a 3-phase AC power supply with or without Neutral. The relay monitors that all phases are available and in the correct phase sequence L1, L2, L3 (U,V,W), that none of the phases are shifted more than 20° in relation to each other and that one or more of the phase voltages are not too low. When all three monitoring criteria are fulfilled the relay is activated. If one or more of the criteria are not fulfilled the relay de-energises and a red LED indicates failure. Fixed limits for energizing and de-energizing the single output relay. With connection of Neutral the measuring abilities are optimal, as Neutral works as a measuring reference. Without Neutral, the phase monitoring relay generates a Neutral reference from the connected phases.

Features

Monitoring of:
- Phase rotation
- Phase shift less than 20°
- Low voltage
- Output SPTD.
- Operating voltage via phases L2 and L3 (V and W).
- Delay= 0,5s to prevent faulty energization and deenergization caused by short interferences.

Function diagram

Voltage monitoring

Phase monitoring

Schematic

View / Dimensions

Technical data

Input signal	3x150 / 3x230 / 3x400 VAC+N
Frequency	45-66Hz
On delay	0.3-0.7s
Output relay	1 NO/NC
Switching frequency	Max. 1000 operations per hour with full load
Electric life span	Min. 3x10⁷ operations with full load
Mounting	35mm DIN-Rail
Connectors	Max. 2x 2.5mm² screw terminals
Supply voltage	V(L2) and W(L3)
Power consumption	3VA
Ambient temperature	-20 - +55°C
Weight	appr. 180g

Order overview / Versions