Product Overview
500 Amp Brass and Copper DC Current Shunt, 100 mV Full Scale, Base Mounted
Condition
Used, clean, and in excellent condition. The two brass terminal blocks are bright with their original machining marks, one stamped HA 500 100 and the other stamped 500AMP and 100MV. Five copper resistance straps bridge the blocks, even in color with no bluing, pitting, or heat discoloration. Both heavy current studs carry their yellow zinc plated hex nuts and washers, and both small slotted potential terminal screws are present. The black molded base shows light scuffs and shallow scratches from handling and storage, and the mounting hole at each end is clean and undamaged. Against the millimeter ruler the base measures roughly 155 mm end to end, and the assembly stands about 50 mm tall including the terminal bolts. Sold as one shunt only, with no meter, leads, or mounting hardware beyond the terminal nuts and screws shown in the photos.
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Product Overview
The Empro HA-500-100 is a heavy current DC shunt that turns 500 amps into a 100 millivolt signal an ordinary meter can read, which works out to a resistance of 0.0002 ohms. It uses the classic four terminal arrangement visible in the photos: the two large plated studs carry the load current through the brass end blocks and the five copper straps between them, while the two small slotted screws set inboard on each block are the potential taps where the meter leads land. Keeping the sense connection separate from the current path is what keeps the reading honest at this kind of amperage. The whole assembly is carried on a black molded insulating base with a mounting hole at each end, so it bolts flat to a panel, a bulkhead, or the floor of a cabinet. The part number is stamped directly into the brass as HA 500 100, with 500AMP and 100MV stamped on the opposite block, so the unit identifies itself even after a label has long since gone missing.
Key Features
- Brand: Empro
- Model: HA-500-100, stamped in the brass as HA 500 100
- Current rating: 500 A
- Output at full scale: 100 mV
- Resistance: 0.0002 ohms
- Four terminal construction: two heavy current studs plus two slotted potential screws
- Resistance element: five copper straps between machined brass end blocks
- Black molded insulating base with one mounting hole at each end
- Approximate size from the ruler photo: base about 155 mm long, roughly 50 mm tall including terminal bolts
- Condition: used, clean, no heat discoloration on the element
- Quantity available: one
Applications
- Solar and off-grid installers metering total battery bank current on a 100 mV panel meter
- Bench technicians building a high current load test rig and needing a stable amp readout
- Calibration and instrument labs setting up a 500 A measurement leg with a known low resistance
- Maintenance electricians replacing a failed or missing shunt on a DC drive, plating line, or battery charger
- EV and battery pack builders logging pack current into a data acquisition input scaled for millivolts
Frequently Asked Questions
What meter does this shunt pair with?
Any meter or input that reads 100 mV full scale, whether that is an analog 0 to 500 A panel movement calibrated for a 100 mV shunt, a digital panel meter, or a data acquisition channel set for a millivolt range.
Which terminals carry the current and which ones does the meter use?
The two large studs with the hex nuts are the current terminals and take the load cable lugs. The two small slotted screws inboard on the brass blocks are the potential taps for the meter leads. Wiring the meter to the big studs instead of the small screws is the most common way to get a reading that drifts with connection resistance.
Is a meter, leads, or mounting hardware included?
No. This listing is for the single shunt assembly shown in the photos, including the terminal nuts, washers, and potential screws already on it. No meter, no cable, no panel screws.
Can it be run at a continuous 500 amps?
Not confirmed. Shunts of this style are commonly derated for sustained duty, and Empro's continuous rating for the HA-500-100 is not printed on the part. Verify against manufacturer data before running it at full load continuously.
Has it been electrically tested?
No. It is sold on the strength of the visual inspection described above: intact straps, clean brass, no heat damage, all terminals present. The 0.0002 ohm figure is the nameplate ratio of 100 mV at 500 A, not a measured value from our bench.
Why buy a single shunt here instead of a multi-pack from a marketplace seller?
Because most projects need one shunt, not five. We sell the exact quantity you need for a repair or a build. Shipping is $8 flat rate and free over $28, so a single part usually lands cheaper than a forced lot, and it goes out the same or next business day from Idaho.
Five copper straps and two blocks of brass are the whole trick: 500 amps go in, and 100 quiet millivolts come out the other side. Bolt it down, land your sense leads on the little screws, and let it do the arithmetic while you watch the needle.
