DNH1 Series Fuse Switch Disconnector With Motor Fuse core monitoring

GRL DNH1-160/30G Fuse Switch Disconnector: Precision Motor Protection with Integrated Monitoring

1. Product Introduction: Intelligent Motor Safeguarding

The GRL DNH1-160/30G is a specialized motor protector developed as an evolution of the original DNH1-160/30 series. It uniquely combines both automatic motor protection and manual protection functions, offering a sophisticated solution for industrial motor circuits.

The standout feature of this specific 160A model is its Motor Fuse Monitoring system, which is designed to provide a fast protection response time and strong breaking capacity to ensure that expensive industrial motors remain safe from electrical faults.

Click to download product catalog DNH1 Series Fuse Switch Disconnector With Fuse core monitoring

2. Accurate Technical Specifications

The DNH1-160/30G is engineered for standard industrial voltage levels with high reliability:

• Rated Operating Voltage (Ue): Optimized for AC 400V and AC 690V systems.

• Rated Operational Current (Ie): Maintains a consistent 160A rating at both 400V and 690V.

• Conventional Thermal Current (Ith): Rated at 160A.

• Short-Circuit Capacity: Offers a robust 100kA breaking capacity at 400V and 50kA at 690V.

• Usage Category: Rated at AC-23B (at 400V) and AC-21B (at 690V), proving its capability in handling highly inductive motor loads.

• Insulation & Resilience: Features a Nominal insulation voltage (Ui) of AC 1000V and a Rated impulse withstand voltage (Uimp) of 12kV.

• Fuse Compatibility: Designed for Size 00 fuses with a power dissipation limit of 12W or less (<= 12W).

3. The Advantage of Motor Fuse Monitoring

The integration of monitoring directly into the 160A frame size addresses the specific vulnerabilities of three-phase motors:

• Phase Failure Protection: One of the leading causes of motor burnout is single-phasing (when one fuse blows but the motor continues to run on two phases). The electronic monitoring system detects a blown fuse instantly, allowing the system to trigger an emergency stop.

• Fast Response Time: Unlike thermal relays which may take time to heat up, the fuse monitoring system reacts to the electrical state of the fuse core, providing a fast protection response to prevent winding damage.

• Integrated Status Signaling: The “Model and Meaning” guide indicates that this unit supports terminal connectors and mechanical fuse monitoring modules (M01), which can provide feedback to control systems.

4. Application Scenarios & Industrial Use Cases

A. Factory Automation and Conveyor Systems

In high-duty cycle environments, motors are frequently started and stopped.

• The Scenario: A 160A motor drives a primary conveyor line. A localized mechanical jam causes a sudden current spike, blowing one fuse.

• The GRL Solution: The DNH1-160/30G monitoring system immediately signals the PLC. Instead of the motor struggling under a two-phase load and burning out, the system shuts down safely, and the LED indicator on the unit points the maintenance team directly to the blown fuse.

B. Pumping and Ventilation Stations

Water treatment and HVAC systems often rely on 400V or 690V motors that run for extended periods.

• The Scenario: A remote pumping station operates at 690V. Due to grid instability, a fuse is compromised.

• The GRL Solution: With a 50kA breaking capacity at 690V, the DNH1-160 ensures the fault is cleared. The integrated monitoring prevents the pump from running in a degraded state, which would otherwise lead to expensive mechanical vibration and motor failure.

5. Environmental & Installation Standards

This unit is built to survive harsh industrial conditions:

• Operating Temperature: Reliable performance from -5°C to +40°C.

• Altitude: Suitable for installations up to 2000 meters.

• Installation: Designed as a Fixed type (Installation method 0) for vertical mounting, ensuring mechanical stability and optimal cooling.

• Durability: Tested for an Electrical life of 200 cycles, ensuring long-term service in secondary distribution.

DNH1 Fuse Switch Disconnector Wiring method

The GRL DNH1-160/30G is a precise, high-performance instrument specifically tailored for the 160A motor protection market. By combining 400V/690V compatibility with specialized electronic monitoring, it bridges the gap between traditional power switching and intelligent industrial automation. For facilities prioritizing “zero downtime” and motor longevity, this 160A protector is the essential choice.

DNH1 Fuse Switch Disconnector Product Showcase

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