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SHM can supply Northern Design and Carlo Gavazzi meters mounted in a sealable rugged
enclosure known as a Meter Management Unit or MMU. The
MMU can be mounted on a wall, or panel surface or top.
The MMU includes meter fuses and a neutral disconnect link -
essential if no fused meter supply has been provided and the
meter must be connected direct to the busbars.
All connections are to DIN-rail terminal blocks inside the unit.
Wiring access is via conduit knock-outs.
Optional shrouded voltage reference sockets can be provided
to allow easy connection of a portable power analyser for
checking/testing. The power analyser's clip-on CTs are used to
monitor the current, and the analyser readings can be cross-checked
against the meter readings (the supply being metered must have a
load connected).
Optional CT shorting links can be provided to facilitate meter
servicing.
- Meter ready to install - no cut-outs or special mounting facilities required
- No need for separate meter fusing
- Saves installation time and costs
- Easy meter servicing
- Easy to connect a power analyser for accuracy and wiring verification tests
Click here
 to view
brochure (82k).
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MMU1C (Standard Width)
Provides voltage fuses and
neutral-disconnect links. Both 3-phase and single-phase
units available. Optional shrouded
voltage test points. Optional CT
shorting links. Model shown is
MMU1C3-P-T. Click on the thumbnails for full-size images. |
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MMU2D (Wide)
As MMU1C but with space for either
two PR303-V meters, one meter and an
additional 6-DIN unit (typically a Modbus interface
module) or various other combinations.
Model shown is
MMU1D3-P-T. Click on the thumbnail for full-size image. |
Ordering Code
MMUnbp
{-Opt}
| n
(Number of Meters) |
0 |
No meter |
| 1 |
One meter |
| 2 |
Two meters |
| b
(Box code) |
A |
MMUnA - 85mm w x 175mm h x 105mm d |
| B |
MMUnB - 130mm w x 175mm h x 110mm d |
| C |
MMUnC - 215mm w x 175mm h x 110mm d |
| D |
MMUnD - 285mm w x 200mm h x 120mm d |
| p
(Phase code) |
3 |
3-Phase |
| 1 |
Single Phase |
| -Opt
(Option code) |
Omitted |
Fuses & Neutral Disconnect only. No test sockets or CT terminals. |
| Other |
See Option Table below |
Example - MMU1C1-T is a 215mm wide box, wired to a
single phase meter with CT shorting terminals.
Option Table
| Option |
Description |
| -P |
Voltage Test Socket option :- For MMUnA & MMUnB these are
L1/L2/L3/N protected voltage test sockets under the flap for use
with shrouded 4mm test plugs.
For MMUnC & MMUnD these are L1/L2/L3/N colour-coded
cap-protected voltage test sockets on the side (L or R)
for use with shrouded 4mm test plugs. |
| -T |
Current Terminal Option.
CT terminals and shorting link terminals. |
| -T-P |
Both Current Terminal and Voltage Test Socket options. |
| {none} |
Fuses & Neutral Disconnect only. No test sockets or CT terminals. |
Meter Combinations
This table shows the size
of box required for various types of meter.
| Meter Type |
Qty |
Box Type |
| No meter. No options or -P option only. |
0 |
MMU0A |
| No meter. -T or -T-P option (Current Terminals). |
0 |
MMU0B |
| Northern Design PR303-V |
1 |
MMU1C |
| 2 |
MMU2D |
| Northern Design PR303, PR323 |
1 |
MMU1C |
| Northern Design PR303, PR323 with Comms Module |
1 |
MMU1D |
| Carlo Gavazzi EM24-DIN |
1 |
MMU1C |
| 2 |
MMU2D |
| Carlo Gavazzi WM2-DIN, WM14 |
1 |
MMU1C |
| Carlo Gavazzi WM22-DIN |
1 |
MMU1D |
| Carlo Gavazzi EM4-DIN (CT) |
1 |
MMU1C |
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