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Schneider Electric LV839266 — Air Circuit Breakers

Schneider LV839266 MN Diagnostic Undervoltage Release, 48 V

MPNLV839266
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Schneider Electric LV839266, MN diagnostic undervoltage release, 48 V AC 50/60 Hz, 48-60 V DC, drawout mounting for MasterPact MTZ1/MTZ2/MTZ3 breakers.

Schneider Electric LV839266 datasheet (PDF)
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Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

LV839266 — Identification
ParameterValue
Product typeVoltage release
ApplicationSafety

Mechanical & connection

LV839266 — Mechanical & connection
ParameterValue
Control typeCommunicating
Mounting modeDrawout

Other specifications

LV839266 — Other specifications
ParameterValue
Response time40 ms +/- 5 % MasterPact MTZ1 90 ms +/- 5 % MasterPact MTZ2 90 ms +/- 5 % MasterPact MTZ3
Device short nameMN diag
Signalling functionError MN open Coil powered
Supply holding power4.5 W 4.5 VA
Voltage release typeUndervoltage release
Threshold tripping voltage0.35...0.7 Un on opening 0.85 Un on closing
Coil voltage48 V AC 50/60 Hz 48...60 V DC

Product details

The Schneider Electric LV839266 is an MN diagnostic undervoltage release for MasterPact MTZ drawout breakers. It trips the breaker when the control voltage drops below 0.35 to 0.7 Un, and allows closing only above 0.85 Un — standard undervoltage protection that prevents automatic reclosure after a supply dip. The communicating control type means it reports its status (MN open, coil powered) back to the breaker's communication network, so a PLC or BMS knows exactly why the breaker tripped without a panel walk-down.

Drawout mounting means this release plugs into the MasterPact MTZ cradle — no wiring to the breaker itself. The control circuit accepts 48 V AC at 50/60 Hz or 48 to 60 V DC, drawing 4.5 W / 4.5 VA holding power. Response time is 40 ms ±5% on MTZ1, 90 ms ±5% on MTZ2 and MTZ3.

Frequently asked questions

What does the MN diagnostic function report?

The MN diagnostic function signals 'Error MN open' and 'Coil powered' status back through the breaker's communication network, so the control system knows the undervoltage release state without a physical inspection.

MPN
LV839266