Schnedier Acti9 Overvoltage Release Series – iMSU
Acti9 iMSU is an overvoltage release. It watches the voltage between phase and neutral. If the voltage gets too high, it opens the circuit breaker beside it and cuts the supply. This protects your equipment from damage. One common cause of high voltage is a broken neutral wire, which can push the voltage on a phase far above normal. The iMSU reacts to this fault. The trip time depends on how high the voltage goes. It begins at 255V and gets faster as the voltage rises, so small rises give time to recover, while large rises trip very quickly. The release is 18mm wide, which is two modules. A red indicator on the front shows the tripped position. For a three phase network with neutral, you use three iMSU units.
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Schnedier Acti9 Overvoltage Release Series - Features
- Voltage monitoring: watches phase to neutral voltage
- Neutral break protection: helps protect equipment if the neutral wire breaks
- Fast trip at high voltage: quicker as the voltage rises
- Action indicator: red mark shows the tripped position
- Wide compatibility: fits many Acti9 devices
Schnedier Acti9 Overvoltage Release Series - Technical Specifications
- Range: Acti9 iMSU (A9A26500)
- Control voltage: 230V AC, 50/60Hz
- Trip threshold: 255V
- Trip times: 275V in 3 to 15s, 300V in 1 to 5s, 350V in 0.25 to 0.75s, 400V in 0.07 to 0.2s
- Size: 82.5mm high, 18mm wide, 68mm deep. Colour: white
- Terminals: 0.5 to 4mm² flexible, 1 to 6mm² rigid. Strip length 10mm, torque 1 N.m
- Operating temperature: -35°C to 70°C. Standard: EN 50550
- Version A9N26500 is available for older ranges such as DPN, C60H-DC and C120
Schnedier Acti9 Overvoltage Release Series - Compatibility and Installation Guide
- Fits Acti9 iC60, iID, iDPN Vigi, iSW-NA, iC40 and iC60 RCBO
- On a three phase network with neutral, fit one iMSU per phase
- Isolate the supply before fitting
- Clip the release beside the breaker and connect the phase and neutral wires
- Test the release before putting the board into service
- Installation should be done by a qualified electrician
Frequently Asked Questions
Q1: Why would the voltage go too high?
A broken neutral wire is a common cause.
Q2: How many do I need on a 3 phase system?
Three, one for each phase.
Q3: Why do the trip times differ?
Small rises trip slowly to avoid false trips. Large rises trip very fast.
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