Switch position indicators are parts of systems. In my work I have seen switch position indicators, in power plants, substations and industrial control cabinets. Switch position indicators show the status of a switch from a distance.

There are two kinds of switch position indicators: switch position indicators and electronic (LED) switch position indicators. Each kind of switch position indicator has its advantages and disadvantages. This article compares the two kinds of switch position indicators by looking at details, performance and common uses.

Mechanical switch position indicator

Working principle

I notice that mechanical indicators use force to move parts. The electromagnetic force pushes the parts through coils, resistors and rotatable magnetic parts. The movement shows the switch position.

Main features

High durability: No electronic components are susceptible to voltage spikes.

Clear visual feedback: Physical motion is easily visible even from a distance.

The wide voltage range typically supports 24 V to 240 V AC voltage. The wide voltage range also supports 24 V to 240 V DC voltage.

Rugged construction: IP52 protection rating, UL94 V0 flame retardant rating, suitable for harsh environments.

Technical Highlights of HEYI Products

Rated voltage: 24V–240V

Angle indication error: ±2°

Withstand voltage: 2000V AC, 1 minute

Operating temperature: –25°C to 55°C

Panel opening size: Φ22.2mm

Electronic (LED) switch position indicator

Working principle

I have used indicators that have LEDs or digital tubes, internal circuitry and resistors. The electronic indicator shows the switch status by giving off light. The electronic indicator gives a energy signal. The electronic indicator can connect to a digital control system.

Main features

Low power consumption: typically ≤1.2VA, or even lower.

I notice that the LEDs give an indication. The LEDs provide lighting that’s easy to see.

The compact and flexible design can be made in shapes and many colors.

Suitable for low-voltage applications: typically optimized for 24V systems.

Technical Highlights of HEYI Products

Rated voltage: 24V or 240V optional

Power consumption as low as 0.5VA

Also features high voltage resistance: 2000V AC, 1 minute.

Protection rating IP52, flame retardant rating UL94 Vb

Operating temperature: -25°C to 55°C

Comparison Table: Mechanical vs. Electronic

Feature	Mechanical Indicator	Electronic (LED) Indicator
Power consumption	≤ 1.0 VA	≤ 1.2 VA (usually lower in practice)
Indication method	Physical movement of mechanical components	LED illumination
Voltage range	24V–240V AC/DC	Typically 24V or 240V AC/DC
Durability	No aging issues; long-term stable indication	LEDs may weaken over long-term operation
Response time	Slightly slower due to mechanical motion	Instantaneous response
Environmental adaptability	Better for high vibration and strong EMI environments	Suitable for stable, low-noise environments
Installation flexibility	Fixed mechanical structure	More flexible designs and color options
Maintenance requirements	Low maintenance, long service interval	LEDs may require replacement over time
Cost	Higher initial cost	More cost-effective initially

How to choose

Choose mechanical if:

Your environment has interference. The environment also has vibration.

You need a solution that lasts a time and is reliable. The solution must be almost maintenance free.

Your system supports a voltage range of 24V–240V. The system can run on high voltage.

You like the physical motion indicators. Physical motion indicators are the ones you prefer.

Choose electronic if:

I think about the power consumption when I design a system. I also think about the signals.

I see that your application environment is stable. I see that your application environment has interference.

You need the indicators. You also need the indicators. You might want the indicators well.

Your system is primarily low voltage (e.g., 24V DC).

In conclusion

Mechanical switch position indicators and electronic switch position indicators each have advantages, in systems. I have seen mechanical indicators survive conditions better. Electronic indicators give efficiency and flexibility in controlled environments. Knowing the operating environment the voltage requirements and the maintenance preferences helps you pick the indicator.

For detailed specifications and product models, please refer to HEYI’s HP series (mechanical) and HY series (electronic) indicator product information.

Compay：HEYI Electrical Co., Ltd.

Brand: HEYI/ASCT

Contact: Bethy

E-mail: heyi@heyiele.com             

Tel: 86-13968747975

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