WestconDigital Panel Meter, 115 VAC 50/60 Hz, 7 W, Panel-Mount LED Readout — Obsolete Legacy Westcon Instrument

Product Description

What this part is

This is a Westcon W3330-03S digital panel meter, rated 115 VAC, 50/60 Hz, 7 W. It is a panel-mount instrument with a digital readout, from the era when Westcon built digital panel meters, AC tachometer generators and process instruments for US industrial panels.

Confirmed from the unit and its nameplate

Type: digital panel meter, panel-mount. Supply: 115 VAC, 50/60 Hz. Power consumption: 7 W. Model: W3330-03S, also written W333003S. Manufacturer: Westcon Inc., USA.

What the 115 VAC / 50/60 Hz / 7 W rating actually tells you:
More than it looks like. A 115 VAC supply means this is a line-powered instrument rather than a low-voltage loop- or 24 VDC-powered one, so it wants a control-power feed and not an instrument bus. The 50/60 Hz tolerance means it is not frequency-fussy and will run on either standard. And 7 W is a meaningful number when adding an instrument to a panel that is already loaded — it is roughly 60 mA at 115 V, which is comfortably inside almost any existing control transformer, but it is also high enough to suggest an LED display and a linear supply rather than a modern switching design. That in turn means it will be tolerant of a dirty supply and will run warm, and the panel design’s ventilation clearance applies.

Decoding the order code

The base model is W3330 and the suffix is -03S. Westcon and its sister DigiTec instrument line used suffix codes to specify range, input type and option content — the pattern is visible in surviving DigiTec order codes such as 2551A-BR34-XXXX-SX, where each block after the base model selects a characteristic. On that basis, -03S is a range or option designation rather than a cosmetic variant. Marsh Bellofram, the manufacturer of record, can resolve the exact configuration from the model and serial.

Who supports Westcon instruments now

This is the single most useful thing to know about a Westcon nameplate, because the company name on the front of the meter no longer exists as an independent business. Westcon Inc. is now a division and brand of Marsh Bellofram Corporation of Newell, West Virginia, where it sits alongside Marsh Bellofram’s DigiTec instrument division. The ownership chain is corroborated by the distributor side as well: both Radwell and Locate Controls catalogue Westcon part numbers under the Marsh Bellofram brand. Marsh Bellofram holds the legacy Westcon documentation and is the right contact for a suffix decode, a wiring diagram or a calibration reference.

Related legacy model families

For anyone matching a mixed panel or hunting a family document, the Westcon model families that turn up in the surplus and repair market are the 2410, 2431A, 2432A, 2435, 2491 and 2551 (the Intelligent DPM), plus the W33xx series to which this meter belongs. W3320N and W3330 are the two W33xx models seen in the market. The W3320N carries an identical 115 VAC / 50/60 Hz / 7 W nameplate rating, which is reasonable evidence that the W33xx models share one power-supply design and are variants within a single family rather than unrelated products.

Quantity and configuration

Sold individually. One meter per purchase, from a single batch, so multiples ordered together match on bezel finish and display appearance.

Lifecycle and the current-production alternative

The W3330 is obsolete and discontinued. For specifying new rather than maintaining existing, the current-production line from the same corporate family is the Marsh Bellofram DigiTec universal-input digital panel meter series — the D3200, D3600 and D3700A. Those are a functional successor family covering the same job with modern universal inputs, with a different cutout, different wiring and different configuration. For an existing panel where the cutout and wiring are fixed, an original W3330 is the low-disruption answer, which is the usual reason people go looking for one.