Product Overview
Iron-Vane Switchboard Ammeter for 5A Current Transformer Input
Condition
Unused new old stock (NOS). Physical inspection confirms a clear glass face, intact mechanical zero-adjuster, and uncorroded brass rear terminal and mounting studs. Rear casing is stamped with inspection mark 46695. Sourced from surplus inventory; internal movement has not been electrically energized or calibrated.
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Product Overview
Simpson Electric Model 2154 (Catalog Number 17751) is a 4.5-inch Century style analog AC ammeter built for switchboard, control cabinet, and generator monitoring. The dial is scaled from 0 to 100 AC Amperes R.M.S. and operates from a standard 0 to 5 amp AC secondary input, designed to pair with an external 100:5 ratio current transformer. Its magnetically damped iron-vane mechanism provides reliable, steady needle movement under fluctuating inductive or resistive loads without requiring external DC operating power.
Key Features
- 0 to 100 A AC RMS dial scale with major divisions at 20-amp increments
- Engineered for external 100:5 A current transformer (5 A full-scale movement)
- Magnetically damped iron-vane movement for stable deflection
- Classic 4.5-inch Century series phenolic case with glass window
- Front-accessible zero-adjustment screw for precise mechanical calibration
- Two heavy threaded brass rear terminal studs with included hardware
- Four corner mounting studs for standard panel cutout installation
- Rated circuit-to-ground insulation of 1150 VAC peak
Applications
- Industrial control console and switchgear line current monitoring
- Generator load balance indication on distribution panels
- Heavy machinery and motor run current tracking in maintenance shops
- Custom power distribution consoles and maker electrical test benches
Frequently Asked Questions
Can this meter connect directly in series with a 100-amp AC power feed?
No. This meter contains a 5-amp movement calibrated to display 100 amps. It must be connected to the secondary winding of a 100:5 ratio current transformer installed around the main conductor.
What mounting and terminal hardware is supplied?
Brass terminal nuts, flat washers, lock washers, and corner mounting hardware are included as shown in the photos.
Why choose this specific Simpson meter?
This unit is verified unused vintage stock with sharp dial graphics and pristine terminal posts, photographed directly so you know the exact component arriving at your bench. This item clears our $28 free shipping threshold on its own, and orders leave our Idaho warehouse the same or next business day.
A digital display only samples the line, but a classic iron-vane pointer moves with the physical weight of the load. Mount it into your console and give your power setup an analog readout that never misses a beat.
