html{display:none} SEL-MW Microcontroller-Based Wye Voltage Sensor | Schweitzer Engineering Laboratories


Microcontroller-Based Wye Voltage Sensor

More economical than a PT, the SEL-MW can be used in place of PTs to detect system voltage loss where exact system voltage measurement reporting is not required. The SEL-MW installs easily on capacitive test points of distribution elbows. It learns and adapts to the unique voltage output level of the capacitive test points to minimize and simplify product calibration for the application.

SEL-MWs are built tough for dependable operation in harsh environments and are economical in eliminating the need for potential transformers or analog sensors. 

Starting At

$350 USD

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Automatic Source Transfers—Apply SEL-MWs in automatic source transfer applications to trigger the operation of the source transfer switchgear upon a loss of source voltage. The SEL-MW detects a loss of system voltage on the primary source that feeds mission-critical loads. Upon detection of the voltage loss, the SEL-MW will open its auxiliary contact, signaling a remote terminal unit (RTU) to initiate a transfer to a backup source.

Isolated Power Supply24 Vdc with a 50 mA maximum dc draw
Arming Requirement24 Vdc nominal supply voltage
Closed Contact≥90% of system voltage
Open Contact≤85% of system voltage
Phase Sensor MaterialConductive EPDM rubber
Housing MaterialConductive EPDM rubber
Separable Connector Component200 A- or 600 A-class connector with test points or basic insulating plugs
Voltage Class15, 25, or 35 kV class
Contact RatingMaximum switching power: 45 W, 50 VA
Maximum switching voltage: 220 V dc, 250 V ac
Maximum switching current: 1.5 A dc, 0.8 A ac
Maximum carrying current 1.5 A dc, 0.8 A ac


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