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The SON H-1 and SON H-3 voltage indicator series is designed for reliable, visual monitoring of voltage presence in low-voltage AC networks. The SON H-1 model monitors the status of a single phase (single-phase circuits), while the SON H-3 monitors three phases in three-phase networks with a neutral conductor. Each monitored phase corresponds to a separate LED, allowing a technician or operator to instantly assess the situation without using measuring instruments.
When voltage is lost on the corresponding phase, the indicator goes out—this simplifies troubleshooting, locating “missing” phases, and performing an initial startup check after service. The housing is made of flame-retardant plastic (UL94-V0 class), which enhances fire safety in control panels, distribution cabinets, and industrial automation cabinets.
The series offers several variants based on indicator color, allowing the display to be adapted to corporate standards or panel logic. For single-phase devices, options are available with red, green, yellow, or blue LEDs; for three-phase devices—three identical LEDs of the corresponding color or a combined module with three multi-colored LEDs.
Name and Purpose
SON H-1 — single-phase voltage presence indicator for ~240 V, 50/60 Hz networks. Connection is made to the L and N terminals. On the front panel — one LED that lights up when voltage is present in the monitored phase.
SON H-3 — a three-phase voltage presence indicator for 3×240 V, 50/60 Hz networks. Connect to terminals L1, L2, L3, and N. Three separate LEDs (one per phase) allow each line to be monitored independently. The combined version features three LEDs of different colors for easy phase identification.
Sub-versions and product codes
SON H-1 — single-phase indicators
- SON H-1R — 1 red LED (product code: 2471550)
- SON H-1G — 1 × green LED (product code: 2471551)
- SON H-1Y — 1 × yellow LED (product code: 2471554)
- SON H-1B — 1 × blue LED (product code: 2471555)
SON H-3 — three-phase indicators
- SON H-3R — 3 red LEDs (product code: 2471552)
- SON H-3G — 3 green LEDs (product code: 2471556)
- SON H-3K — 3 LEDs (yellow, green, red; combined module) (product code: 2471553)
Note: Within the same platform, there is also a two-phase SON H-2GR indicator (2 LEDs — green and red), for 220 V networks, terminals L1, L2, N. If necessary, it can be used in specific circuits with two power lines.
Technical Specifications (Summary)
- Power Supply and Control (SON H-1): ~240 V (range -25% to +10%), 50/60 Hz; terminals L, N.
- Power supply and control (SON H-3): 3×240 V (range –25% … +10%), 50/60 Hz; terminals L1, L2, L3, N.
- Power consumption: approx. 1.8 W.
- Visual indication: 1 LED (for SON H-1) or 3 LEDs (for SON H-3): red / green / yellow / blue or combined (yellow, green, red).
- Operating temperature range: -15…+60 °C.
- Conductors and tightening torque: 1×4 mm² (solid or stranded), torque 0.6 N·m.
- Housing material: flame-retardant plastic (UL94-V0).
- EMC/immunity compliance: IEC EN 61000-3-2
Key advantages of the SON H-1 / SON H-3 series
- Instant diagnostics: a separate LED per phase allows you to immediately see a voltage drop and pinpoint the problem.
- Safe indication: flame-retardant housing (UL94-V0) reduces the risk of flame spread inside the cabinet.
- Flexible indication options: multiple LED colors and a combined version for convenient visual logic.
- Wide temperature range: stable operation from -15 to +60°C in residential and industrial environments.
- Low power consumption: approximately 1.8 W, which has virtually no impact on the control cabinet’s power balance.
- Standardized connection: standard L/N or L1/L2/L3/N terminals, convenient for integration into panel equipment.
- Electromagnetic compatibility: compliance with a range of IEC/EN 61000 standards ensures reliable indication.
Applications
The SON H-1 and SON H-3 indicators are used in distribution panels, power cabinets, automatic transfer switch panels, HVAC control cabinets, compressor cabinets, pump stations, conveyor lines, lighting systems, as well as in laboratory test benches and training panels. They are also suitable for service workstations where a quick visual assessment of power availability is required.
Installation and Operation Recommendations
- Observe the rated voltage and frequency: ~240 V for SON H-1 and 3×240 V for SON H-3 (tolerances –25%…+10%).
- Connect conductors with a recommended cross-section of 1×4 mm² using a tightening torque of 0.6 N·m.
- Ensure operation within the temperature range of –15…+60 °C and in a dry, ventilated cabinet space.
- Use color-coded versions for clear indication of priority lines or logic states.
- After installation, check the illumination of each LED to verify the presence of voltage in the corresponding phase.
About TOTAL ENERGO LLC
TOTAL ENERGO LLC — a supplier of electrical solutions for residential, commercial, and industrial facilities. We help select the optimal voltage indicators from the SON H-1 / SON H-3 series for a specific panel or line application, provide technical advice on connection and operation, support implementation at facilities, and provide warranty and post-warranty service.