HXA-30S Helmet-Mounted Proximity Alarm

HASEGAWA HXA-30S is a helmet-mounted proximity alarm developed for overhead lines from 11 kV to 66 kV. It is fixed to the safety helmet with a band and holders, and produces an audible warning of at least 65 dB when the worker's head enters the electric field of a live conductor. Common 33 kV and 35 kV distribution lines sit well within this range.

Under normal conditions, on an 11 kV line with a phase-to-earth voltage of 6.4 kV, the alarm starts at approximately 100 cm. The device works on both 50 Hz and 60 Hz networks. The HXA-30S is made in Japan and supplied as a genuine HASEGAWA product to business customers by HASEGAWA Türkiye, the official distributor in Türkiye.

Where is it used?

The HXA-30S is a practical solution for crews working across the wide voltage band between distribution and transmission:

• Pole-top maintenance, fault repair and extension work on 33 kV–35 kV distribution lines
• Bracket, crossarm and insulator replacement on overhead lines up to 66 kV
• Double-circuit poles with a live circuit beside the de-energised one
• Field maintenance on the medium-voltage collection lines of wind and solar plants
• Periodic checks on industrial sites' own overhead lines

The helmet-mounted design keeps the alarm in a fixed position during climbing and aerial platform work, when the arms are constantly moving. Having the sound close to the ear is an advantage on noisy sites.

HXA-30S or HXA-6S?

	HXA-6S	HXA-30S	HXA-70S
Operating voltage	AC 6.6 kV – 33 kV	AC 11 kV – 66 kV	AC 66 kV – 110 kV
Theoretical alarm distance at 11 kV	1.4 m	1.0 m	0.8 m
Theoretical alarm distance at 33 kV	2.5 m	1.7 m	1.5 m
Warning	Audible + flashing LED	Audible + flashing LED	Audible + flashing LED
Protection	IP67	IP67	IP67
Frequency	50/60 Hz	50/60 Hz	50/60 Hz
Sound level	At least 65 dB at 1 m	At least 65 dB at 1 m	At least 65 dB at 1 m
Battery	CR2032 (3 V) × 1, ~1 year standby	CR2032 (3 V) × 1, ~1 year standby	CR2032 (3 V) × 1, ~1 year standby
Weight (body only)	Approx. 45 g	Approx. 45 g	Approx. 45 g
Dimensions	94 × 48 × 27.5 mm	94 × 48 × 27.5 mm	94 × 48 × 27.5 mm

The three helmet-mounted models use the same body, battery and accessory set. If you only work on lines up to 33 kV, the HXA-6S is suitable; for 66 kV – 110 kV lines, the HXA-70S. The arm-mounted version of the same voltage class, the HXA-30, warns at 70 cm at 11 kV; the helmet-mounted HXA-30S warns at 100 cm, i.e. earlier.

Current HXA Series catalogue features

According to the current HASEGAWA HXA Series brochure, the helmet-mounted models (HXA-6S, HXA-30S, HXA-70S) offer:

• Audible and visual warning: buzzer plus flashing LED when a live part is approached; at least 65 dB at 1 m.
• No power switch: always on standby, so it cannot be left switched off.
• IP67 dust and water protection (IEC 60529): dust-tight and protected against temporary immersion.
• Long standby life: about 1 year on standby and about 15 hours of continuous alarm from one CR2032 battery.
• Light body: about 45 g.
• International references: the brochure lists EN 61326-1 Class B, CISPR 11:2015, EN 61010-1, IEC TR 61243-6 and ASTM F3283/F3283M-18; the series has passed EMC testing (IEC 61000-4-2, IEC 61000-4-3, IEC 61000-4-8).
• Made in Japan under strict quality control.

Theoretical alarm distances by line voltage

Line voltage (phase-to-phase)	HXA-6S	HXA-30S	HXA-70S
6 kV	1.1 m	0.7 m	0.6 m
11 kV	1.4 m	1.0 m	0.8 m
22 kV	2.0 m	1.4 m	1.2 m
33 kV	2.5 m	1.7 m	1.5 m
66 kV	3.5 m	2.3 m	2.1 m
110 kV	4.5 m	3.0 m	2.7 m

The values are theoretical, under standard conditions. Real alarm distance varies with conductor arrangement, surrounding structures, earthing conditions and the work environment; verify operation on site. The HXA Series is an auxiliary warning device and does not replace required safety clearances or verification of absence of voltage.

Technical specifications

• Operating voltage: AC 11 kV – 66 kV
• Standard alarm start distance: 100 cm on an 11 kV line (6.4 kV phase-to-earth), under normal conditions
• Frequency: 50/60 Hz
• Sound level: at least 65 dB
• Battery: 1 × JIS CR2032 (3 V); about 1 year on standby, about 15 hours of continuous alarm
• Warning: audible (buzzer) and flashing LED; no power switch, always on standby
• Protection: IP67 (IEC 60529)
• Permissible temperature: −10 °C … +40 °C, without condensation on the surface or inside
• Weight: approx. 45 g (body only)
• Dimensions: 94 × 48 × 27.5 mm
• Accessories: fastening band, 2 holders

Limits of use and safety

The HXA-30S is only a warning layer. Before starting work on the line, verify the absence of voltage with a hot stick high voltage detector suited to the line's voltage class and earth the line. The distance at which the alarm starts varies with line voltage; on lines approaching 66 kV, the statutory minimum approach distance may be greater than the alarm distance, so the distance in the work plan must take precedence.

Do not use the device in condensing conditions; make sure the body is dry when moving between warm and cold environments. Check the battery at the start of each shift and confirm that the holders sit firmly on the helmet. For more information, read our article What Is a Proximity Alarm?

For model selection and correct use in the field, see our Helmet-Mounted Proximity Alarm guide.

Why buy from HASEGAWA Türkiye?

• Model selection that clarifies the boundary between the HXA-30S and HXA-6S for networks built mainly around 33 kV–35 kV
• Helmet-mounted and arm-mounted alarms planned as a mix in the same quotation, to suit your crew structure
• Same-day quotation on business days and supply with commercial invoice from the official distributor in Türkiye