Buyer guide · 2026

Panel Meter Sizing — 72x72 vs 96x96 Explained in Plain Language

Both refer to the panel door cut-out in millimetres. Electrical spec is usually the same. But get the size wrong and the meter either rattles in an oversize hole or won't fit at all. Here's how to pick.

Published Apr 2026 · By Santosh Electricals team

What the numbers mean

A "72x72 panel meter" needs a 68x68mm (±1mm) cut-out in the panel door. The meter's front bezel is 72x72mm (which is why it's called that), and it sits over the hole sealed by a gasket. Same logic for 96x96 — bezel size is 96x96mm, cut-out is 92x92mm.

72x72mm → cut-out 68x68mm, depth behind panel ~75mm typical.
96x96mm → cut-out 92x92mm, depth behind panel ~75mm typical.

Pick 72x72 when…

Panel is a starter / control panel — limited door real estate.
You're mounting 6–12 meters / indicators / pilot lamps side by side.
It's a compact DG synchronising panel or pump-starter panel.
You need an hour meter, voltmeter or ammeter — simple single-parameter display.

Typical panel-meter options: hour / runtime meter (hour meter), V/A combo meter (V/A), 72x72 multifunction meter (MFM with RS485 option).

Pick 96x96 when…

Panel is an LT / MCC board — larger door, bigger load.
Operators read the meter from 2–3 metres away.
You need a multifunction meter (MFM) with multiple parameters on one screen.
You want a Maximum Demand Controller with relay outputs.
Solar / bi-directional metering with VAF display.

Typical panel-meter options: V/A panel meters (V/A), digital voltmeter (voltmeter), digital ammeter (ammeter), VAF / bi-directional meter (VAF / bi-directional), maximum demand controller (MDC), multifunction meter (RS485 Modbus) (MFM with Modbus).

Feature availability by size

Feature	72x72	96x96
Hour / runtime counter	✓ (hour / runtime meter)	On request
Voltmeter / ammeter	✓	✓
Multifunction meter (MFM)	✓ (72x72 multifunction meter)	✓ (multifunction meter (RS485 Modbus))
VAF combo	Limited	✓ (VAF / bi-directional meter)
Maximum Demand Controller	Limited	✓ (maximum demand controller)
RS485 Modbus	✓ (MFBW option)	✓ (multifunction meter (RS485 Modbus))
Bi-directional	Rare	✓ (VAF / bi-directional meter)

Rule of thumb: if you need more than V and A on one screen, go 96x96.

Installation tips panel builders keep forgetting

Mark the cut-out before powder coat — retrofitting a hole after paint is ugly.
Gap between meters: leave 10mm minimum between two 72x72 or two 96x96 meters for clamps.
Depth behind the door: meter body is ~75mm. Panels with busbar too close to door need space check first.
Gasket torque: hand-tighten the clamp screws. Over-tightening cracks the bezel.
CT polarity: for ammeters and MFMs, P1/P2 and S1/S2 must match. Reversed CT = negative reading = angry operator.

Common mistakes we see on BOQs

Ordering 96x96 for a compact starter panel — door is too small, retrofit cost.
Ordering 72x72 MFBW when the operator stands 4m away — can't read the display.
Specifying MDC (maximum demand controller) as 72x72 — it's only available in 96x96. Catch this before cut-out.
Missing Modbus option — ordered the base multifunction meter (RS485 Modbus) / MFBW, later needed BMS integration, had to swap.

Mixing sizes in one panel

Totally fine and normal. Typical LT panel might have one 96x96 MFM on the incomer side and two or three 72x72 ammeters on the outgoing feeders. Keep same brand family if possible — simplifies spares.