Description
Weston Model 506 DC Ammeter 0-120 Amperes Panel Meter 50mV Shunt Type
The Weston Model 506 is a round panel-mount DC ammeter manufactured by Weston Electrical Instrument Corp. of Newark, New Jersey, USA. It reads direct current from 0 to 120 amperes in major scale divisions of 30A (0, 30, 60, 90, 120), and is designed for use with an external 50mV shunt — a standard shunt-type ammeter configuration that allows the meter movement itself to handle only a small millivolt signal while the shunt carries the full line current.
Specifications & What's Included
- Manufacturer: Weston Electrical Instrument Corp., Newark, NJ, USA
- Model: 506
- Current type: DC (Direct Current)
- Measurement range: 0–120 Amperes
- Scale divisions: 0, 30, 60, 90, 120A
- Shunt requirement: External 50mV shunt (not included)
- Mounting style: Round panel mount
- Terminals: Two brass binding posts on rear
- Front panel: White dial face with black scale markings; needle with zero-adjust knob
- Housing: Round black bakelite/metal bezel with four mounting holes
- Patents: 1,579,849
- Meter only — no shunt or mounting hardware included
Applications
Shunt-type DC panel ammeters like the Weston Model 506 are used to monitor direct current in electrical distribution panels, battery charging systems, DC power supplies, motor control panels, and industrial switchboards. The meter movement itself draws negligible current; the external 50mV shunt is wired in series with the load, and the meter reads the proportional millivolt drop across the shunt to indicate full-scale current. This configuration was — and still is — the standard approach for measuring high DC currents with a compact, accurate panel instrument. Weston Electrical Instrument Corp. was one of the leading American makers of precision electrical measuring instruments through much of the 20th century, and their panel meters were widely used in industrial, utility, and marine applications. A meter in the 0–120A range suits applications such as battery bank monitoring, DC motor current measurement, generator output monitoring, and vintage electrical restoration projects. This instrument dates from the mid-20th century era of American-made panel instrumentation.
This Weston Model 506 DC ammeter has been inspected and appears to be in good used condition. The dial face is clean and legible, with the scale markings and needle intact. The brass binding post terminals on the rear show some age-related patina, which is normal for a vintage instrument of this type. The black panel-mount bezel shows typical handling wear consistent with prior service use. It has not been powered up or tested at our facility, but appears to have come from a working environment. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Weston |
Model: |
506 |
MPN: |
506 |
Type: |
DC Panel Ammeter |
SKU: |
49371 |
Measurement Range: |
0-120 Amperes DC |
Scale Increments: |
30A (0, 30, 60, 90, 120) |
Shunt Requirement: |
External 50mV shunt required |
Current Type: |
DC (Direct Current) |
Mounting Style: |
Panel Mount |
Panel Shape: |
Round |
Terminal Type: |
Brass binding posts |
Manufacturer: |
Weston Electrical Instrument Corp., Newark, NJ, USA |
Patents: |
1,579,849 |
Country/Region of Manufacture: |
United States |
Seller Notes: |
Meter only — no shunt or mounting hardware included. |
Condition Notes: |
This Weston Model 506 DC ammeter has been inspected and is in good used condition. The dial face is clean and legible; brass terminals show age patina. Not tested at our facility but appears pulled from service. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |
