SmartVolt™ · Wearable non-contact voltage detectorKnow a line is live before you reach it.
SmartVolt clips onto a helmet, wrist or harness and sounds an alarm when a worker comes within range of a live AC conductor: about 2.5 m from a 66 kV line. Built for linemen, cable crews and maintenance teams who work near energised equipment every day.
Switch on, test, clip on, get warned.
SmartVolt senses the electric field around a live AC conductor. It needs no contact and no operator action once it is on.
Switch on
Press the red button on top. The three LEDs show battery level, and the green and red LEDs underneath light up to confirm the alarms work.
Test at a socket
Hold it near a live 220 V socket before every shift. It should beep and flash red. That proves it is detecting.
Mount it
Clip it to the helmet, wrist or PPE using the supplied mounts. The green LED blinks every 5 seconds to show it is on watch.
Work. It warns.
Come within range of a live AC field and it beeps with a red LED alert, before you can reach the conductor.
SmartPause™. When a worker deliberately enters a known danger zone, one press silences the alarm. SmartVolt re-arms itself automatically once they move out of the field, and can also be re-armed by hand. No one has to remember to switch it back on.
Three models. One detection engine.
All SmartVolt models detect the same 220 V – 66 kV range at the same distances and share SmartPause™. They differ in power source, runtime, weight and housing finish.
Rechargeable v2.0
The latest SmartVolt: smaller, 50 g, and 200 hours on a one-hour USB-C charge.
Dual Tone · AAA
No charging, ever. Swap AAA cells and keep working for up to 150 hours per set.
Mono Tone · AAA
The AAA-cell SmartVolt in an all-grey housing. Same detection, same 150-hour runtime.
Choosing: pick JSVR-DT for the lightest, longest-running rechargeable unit. Pick an AAA-cell model (Dual Tone or Mono Tone) where charging points are scarce and crews can carry spare cells.
SmartVolt models side by side
All values from the current technical data sheet for each model.
| JSVR-DTRechargeable v2.0 | JSV-DTCDual Tone · AAA | JSV-MTCMono Tone · AAA | |
|---|---|---|---|
| Detection | |||
| AC voltage range | 220 V – 66 kV | 220 V – 66 kV | 220 V – 66 kV |
| Alarm distance at 66 kV | 2.5 m | 2.5 m | 2.5 m |
| Alerts | Sound (buzzer) and light (red LED) | Sound (buzzer) and light (red LED) | Sound (buzzer) and light (red LED) |
| SmartPause™ auto re-arm | |||
| Power | |||
| Power source | 600 mAh rechargeable | AAA cells, swappable | AAA cells, swappable |
| Runtime (varies with use) | 200 h | 150 h | 150 h |
| Charge time | 1 hour | No charging | No charging |
| Build | |||
| Weight | 50 g | 70 g | 70 g |
| Dimensions | 61 × 48.9 × 32.15 mm | 62 × 60 × 35 mm | 62 × 60 × 35 mm |
| Ingress protection | IP55 | IP55 | IP55 |
| Housing | Dual Tone | Dual Tone | Mono Tone |
| Tested and certified by | — | NTH Kolkata · ERDA | NTH Kolkata · ERDA |
| View → | View → | View → | |
The higher the voltage, the earlier the warning.
Detection distance by AC voltage
| AC voltage | Distance (m) |
|---|---|
| 220 V | 0.15 |
| 1 kV | 1.1 |
| 6.6 kV | 1.7 |
| 11 kV | 1.9 |
| 33 kV | 2.2 |
| 66 kV | 2.5 |
Distances at which the alarm triggers, per the SmartVolt technical data sheets. Treat them as typical values. The actual distance depends on conductor geometry and surroundings.
Warned at a distance, not on contact
A conventional tester must touch the conductor. SmartVolt raises the alarm while there is still room to stop. That distance grows with the voltage of the line.
- About 0.15 m from a 220 V socket or service cable
- About 1.9 m from an 11 kV distribution line
- About 2.5 m from a 66 kV line
- Audible buzzer and red LED together
An early warning, not a permit to work. Non-contact detection tells a worker that a live field is near. It does not prove a conductor is dead. Keep isolating, testing with an approved contact tester and earthing before any work on a line, exactly as your safety rules require.
Worn where the hands and head go first.
A detector only helps if it is on the worker when they reach up. SmartVolt weighs 50–70 g and clips on in seconds.
Three mounting options in every kit: helmet, wrist band and side/PPE clip. Box contents vary by model; see each model page.
Built for crews who work beside live conductors
Power distribution linemen
Fault repair, new connections and pole work on LT and HT distribution networks.
Telecom and ISP field crews
Cable laying and repair on poles shared with power lines, where the line above is often live.
Plant and substation maintenance
Electrical maintenance teams carrying out preliminary ‘live or dead’ checks around panels and switchgear.
Construction and infrastructure
Workers, scaffolders and crane crews operating near overhead lines.
Chosen over the incumbent after a 45‑day trial
“The SmartVolt fundamentally changed how our Electrical Maintenance Engineer teams approach preliminary checks. We no longer had to risk contact or rely on complicated procedures for a simple ‘live or dead’ confirmation.”Network Maintenance Engineer, leading Indian internet service provider, Hyderabad
Tested, certified and rated
National Test House, Kolkata
AAA-cell models (JSV-DTC, JSV-MTC): tested and certified, as stated in their data sheets.
ERDA
Tested and certified, as stated in the data sheets of the same models.
Ingress protection IP55
All three models: protected against dust and water jets from any direction. Not for submersion.
More from Electrical Safety
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Tripod-mounted sentry that watches a whole work zone, up to 3.1 m high.
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ClearVolt™
Vehicle-mounted detector that arms itself with the ignition.
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Kavach™ Dielectric Harness
Non-conductive full-body harness with built-in voltage detection.
View product →
Electrical Safety Helmet
IS 2925 helmet, Class E, withstands 20 kV for 30 minutes.
View product →Common questions
Can't find what you need? Call +91 8340 84 84 84 or write to info@jarshsafety.com.
What voltage does SmartVolt detect?
Does SmartVolt detect DC?
Is SmartVolt a replacement for a contact voltage tester or earthing?
What is the difference between Mono Tone and Dual Tone?
What does SmartPause™ do?
How do I know it is working?
Can it be used in the rain?
What temperature range does it work in?
Where can it be worn?
Do you supply in bulk and through dealers?
Equip your line crews with SmartVolt.
Tell us how many crews you run and how they work. We'll recommend the right model and mounting, and arrange a field demo.