DIN-Rail Adjustable Over & Under Voltage Protector with Current Display

Product Overview

This intelligent over & under voltage protector is a dedicated power quality protection device for 230V single-phase low-voltage distribution systems. It integrates real-time voltage and current monitoring, overvoltage protection, undervoltage protection and overcurrent protection into one compact DIN-rail module, safeguarding downstream electrical appliances and electronic equipment from damage caused by grid voltage anomalies, neutral line faults and overload current.

It features high-brightness dual-color LED digital display: red for real-time voltage, green for real-time current, with clear and intuitive reading. All protection thresholds can be set independently via front-panel buttons to adapt to different grid environments and load requirements. After the fault is eliminated and the power supply returns to normal, the protector will automatically delay reset and restore power supply without manual operation. Standard 35mm DIN rail mounting enables fast installation in distribution boxes, consumer units and small control panels. It is widely used in residential buildings, rental apartments, commercial shops and light industrial sites.

Key Product Features

✅ Dual-Color Digital V&A Display High-brightness LED digital tube, red display for real-time line voltage, green display for real-time load current. Clear and intuitive reading, convenient for on-site inspection and parameter debugging.

✅ 3-in-1 Adjustable Protection Supports independent threshold setting for overvoltage, undervoltage and overcurrent protection. Flexible adjustment via front panel buttons to match different grid conditions and load protection requirements.

✅ Automatic Delay Self-Reset After the fault is removed and the voltage/current returns to the normal range, the protector automatically resets and restores power after a set delay. No manual closing operation is required, reducing operation and maintenance costs.

✅ Standard 35mm DIN-Rail Mounting Universal modular design, directly snaps onto standard 35mm DIN rail. Compatible with mainstream distribution box dimensions, can directly replace traditional voltage protection devices without cabinet modification.

✅ Intuitive Button Operation Equipped with SET key, up/down adjustment keys and power key. Simple operation flow, quick parameter setting. R/T status indicator shows working and fault status at a glance.

✅ Flame-Retardant High-Strength Housing Made of high-grade flame-retardant engineering plastic, excellent dielectric strength, mechanical toughness and aging resistance. Stable and reliable performance in long-term energized distribution environment.

✅ Accurate Sampling & Strong Anti-Interference Precision voltage and current sampling circuit with optimized anti-interference design. Accurate detection, no false tripping and no refusal tripping, reliable protection performance for complex on-site grid environments.

Technical Specifications

Application Scenarios

• Residential main distribution board incoming protection and household appliance circuit protection
• Commercial offices, retail shops and small business distribution systems
• Precision electronic equipment, server rooms and IT facility front-end power protection
• Rental apartments, dormitories and shared accommodation power distribution protection
• Small industrial equipment, lighting systems and vending machine voltage anomaly protection

Our Advantages

1. Accurate and stable sampling algorithm High-precision sampling circuit with optimized anti-interference design, accurate voltage and current detection, no false tripping and no refusal tripping under complex grid conditions.
2. Fully adjustable protection parameters Overvoltage, undervoltage and overcurrent thresholds can be set independently, flexibly adapting to protection requirements of different regions and different loads.
3. Strict factory quality inspection Each unit undergoes voltage calibration, overcurrent test and aging test before delivery to ensure stable and reliable performance on site.
4. Standard size with high compatibility Universal DIN-rail mounting dimensions, can directly replace similar over & under voltage protectors on the market without distribution box modification.
5. Complete technical documentation support Provide dimension drawings, wiring diagrams and selection guides to support project design and tender bidding. Fast overseas technical response.

Custom Solution

We provide project-oriented custom solutions for over & under voltage protectors:

• OEM Brand Customization: Custom silk-screen logo and model marking on product housing for branded resale.
• Parameter Customization: Custom default protection thresholds, delay time and other parameters according to customer requirements.
• Export-grade Custom Packing: Neutral carton, customer-branded packaging, seaworthy reinforced packing for long-distance sea transportation.
• Project-level Technical Support: Supply CAD drawings, test reports and certification documents for project bidding and local approval.
• Large-order Priority Production: Priority production scheduling for large-volume project orders to guarantee delivery lead time.

Share your required current rating, protection parameters and application scenario, our engineers will recommend the most suitable protection solution within 24 working hours.

FAQ

Q1: What protection functions does this device have?

A: It provides three independent protection functions: overvoltage protection, undervoltage protection and overcurrent protection. All protection thresholds can be adjusted separately via the front panel buttons.

Q2: Will it reset automatically after the fault is cleared?

A: Yes. After the voltage or current returns to the normal range and lasts for the set delay time, the protector will automatically close and restore power supply, no manual operation is required.

Q3: Can I adjust the protection values by myself on site?

A: Yes. You can set the overvoltage value, undervoltage value and overcurrent value through the SET button and up/down adjustment buttons on the front panel, with intuitive digital display feedback.

Q4: Is this protector DIN-rail mountable?

A: Yes, it fits standard 35mm DIN rail, which is the universal mounting standard for low-voltage modular distribution components.

Q5: What information does the digital display show?

A: The red digital area shows real-time line voltage, and the green digital area shows real-time load current. You can also switch to view protection setting parameters via buttons.

Q6: Do you support OEM private label service for distributors?

A: Yes, we support custom logo and parameter marking printing on the product, with a certain MOQ applied for OEM service.

Q7: Where is this protector usually installed?

A: It is usually installed in residential distribution boxes, consumer units and small commercial distribution panels, to protect downstream electrical appliances and electronic equipment from voltage anomalies and overcurrent damage.

Package Content

1 × Adjustable Over & Under Voltage Protector with Current Display 1 × Quick Start Guide