HST-35V Universal Joint High Voltage Detector

HASEGAWA HST-35V is a universal joint medium voltage detector that fits on the end of a common insulating stick via a universal joint. On 50/60 Hz networks in the AC 6 kV – 35 kV range it signals the presence of voltage with an intermittent audible alarm and a red LED. It is designed for DSO maintenance teams, industrial sites that operate their own MV substations, and operating staff at solar and wind farms.

Common European distribution levels such as 10 kV, 15 kV, 20 kV, 30 kV and 33 kV all fall within this range. As the detector comes as a separate head, the team fits it to the stick they already use in the field only when needed, and it takes up little space in the kit bag. Manufactured in Japan by Hasegawa Electric, it is supplied by HASEGAWA Türkiye, the official HASEGAWA distributor in Türkiye, to customers across Europe.

Where is it used?

• Overhead line maintenance: verifying the absence of voltage on distribution lines up to 35 kV after an outage has been taken, before earths are applied to the conductors.
• Compact and indoor substations: checks after switching on incoming and outgoing cubicles, cable terminations and MV busbars.
• Renewable energy sites: planned maintenance on solar and wind collector circuits and the MV connections from inverter stations to the substation.
• Outdoor conditions: IPX4-equivalent protection gives resistance to splashing water, and the −10 °C … +50 °C operating range covers winter and summer conditions. In rain, the insulation condition of the stick must be assessed separately.

In noisy switchyards the intermittent sound of at least 70 dB, and in bright surroundings the red LED visible at 8000 lx, keep the result readable.

HST-35V or HWB-35?

	HST-35V	HWB-35
Operating voltage (AC)	6 kV – 35 kV	6 kV – 35 kV
Audible alarm	At least 70 dB, intermittent	At least 80 dB, intermittent
Visual indication	Red LED, visible at 8000 lx	Flashing red LED, distinguishable at 50,000 lx; green standby LED
Water resistance	IPX4 equivalent	IP45 equivalent
Battery	2 × LR44 (1.5 V)	2 × R03 (1.5 V)
Operating temperature	−10 °C … +50 °C	−10 °C … +50 °C

Both models cover the same voltage range. The compact HST-35V is sufficient for basic voltage checks; teams who work a lot outdoors in direct sunlight and want stronger indication may prefer the HWB-35. For higher levels, the same series includes the HST-138V and HST-550V.

Technical specifications

• Operating voltage: AC 6 kV – 35 kV, 50/60 Hz
• Audible indication: intermittent sound, at least 70 dB
• Visual indication: red LED, visible at 8000 lx ambient light
• Water resistance: IPX4 equivalent
• Operating temperature: −10 °C … +50 °C
• Battery: 2 × LR44 (1.5 V)
• Accessory: storage case

Limits of use and safety

The HST-35V is intended only for AC 6 kV – 35 kV systems; it is not used on low voltage panels, DC installations or networks above 35 kV. Before every measurement, confirm that the detector works with a suitable voltage detector tester or at a point known to be live, and repeat this check when the job is finished. The detector and stick must be dry, clean and undamaged, and the stick must be held only by its handle area. Wear PPE such as HV gloves, a safety helmet and a face shield, and follow your organisation's approach distance rules. The detector only verifies the absence of voltage; it does not replace earthing of the work area. For periodic checks, see this guide.

Why buy from HASEGAWA Türkiye?

• Comparative model recommendation between the HST-35V and HWB-35 for networks from 6 kV to 35 kV
• The detector can be combined with testers and earthing equipment in the same quotation
• Project-based pricing with a commercial invoice for purchases to be distributed across several teams