DNRH8 DC 1500V Combined Switch in Energy Storage System

Rated Voltage (VDC)：

1500 V

Rated Current (A)：

200, 225, 250, 275, 325, 400, 500, 630

Rated Insulation Voltage (Ui) 1500 V

Making Capacity (Icm)：

15 kA

Withstand Capacity (Icw)：

15 kA @0.1 s / 10 kA @1 s

Conditional Short Circuit Current (Iq)：

100 kA

Electrical Lifespan (cycles)：

400–2000

Mechanical Lifespan (cycles)：

> 10,000

Control Method：

Manual / Remote (24 V)

Ambient Temperature：

–40 °C to +80 °C (derate >60 °C)

Humidity：

≤ 50% @40 °C; ≤ 90% @20 °C

Altitude：

≤ 2000 m (derate to 5000 m)

Pollution Degree：

III

Installation Category：

IV (power), III (control)

Ingress Protection：

IP20 (internal) / IP67 (external)

Optional Functions：

Undervoltage Module, Relay Module

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Description

DNRH8 Combined Switch

Description

The GRL DNRH8 Combined Switch is an all‑in‑one DC load‑switching and isolation solution, rated for up to 1500 VDC and 630 A. Designed to meet DC‑PV1, DC‑PV2, and DC‑21B utilization categories, it integrates main and pre‑charge relays into a single compact, IP67‑rated housing. Ideal for photovoltaic (PV) systems, battery energy storage systems (BESS), and industrial DC applications, the DNRH8 streamlines installation, reduces wiring errors, and delivers fast, reliable switching with undervoltage protection.

Technical Features

Voltage & Current: DC 1500 V, operational current 200 A–630 A.
Switching Capacity: Making/withstand capacity 15 kA (0.1 s) / 10 kA (1 s); conditional short‑circuit current 100 kA.
Arc Performance: Arc distance minimized; arcing time < 3 ms.
Protection Rating: IP67 (external); IP20 (internal).
Control Modes: Manual or 24 V remote control with auto/manual selection.
Undervoltage Module: Active/passive trip options (response < 0.5 s, 2 min power‑loss backup).
Optional Relay Module: JDQMK series integrates main/pre‑charge relays and resistors.
Environmental Tolerance: –40 °C to +80 °C (derating above +60 °C); altitude up to 5000 m with derating.
Durability: > 10,000 mechanical cycles; 400–2000 electrical cycles.

Technical Parameter

Parameter	Value
Rated Operational Voltage (VDC)	1500 V
Rated Operational Current (A)	200, 225, 250, 275, 325, 400, 500, 630
Rated Insulation Voltage (Ui)	1500 V
Making Capacity (Icm)	15 kA
Withstand Capacity (Icw)	15 kA @0.1 s / 10 kA @1 s
Conditional Short Circuit Current (Iq)	100 kA
Electrical Lifespan (cycles)	400–2000
Mechanical Lifespan (cycles)	> 10 000
Control Method	Manual / Remote (24 V)
Ambient Temperature	–40 °C to +80 °C (derate >60 °C)
Humidity	≤ 50% @40 °C; ≤ 90% @20 °C
Altitude	≤ 2000 m (derate to 5000 m)
Pollution Degree	III
Installation Category	IV (power), III (control)
Ingress Protection	IP20 (internal) / IP67 (external)
Optional Functions	Undervoltage Module, Relay Module

DNRH8 Combined Switch Benefits

Integrated Design: Combines two switches and relays into one unit—saves panel space and wiring.

Enhanced Safety: IP67 waterproofing and lockable OFF position prevent accidental operation.

Smart Control: Low‐power (< 1 W) standby, real‐time status feedback, and fast switching (0.5 s).

Reliable Operation: High short circuit rating and minimal arcing ensure long equipment life.

Flexible Installation: Cabinet internal (IP20) or external (IP67) mounting options for all environments.

DNRH8 Combined Switch Application Scenarios

Solar PV Arrays: String‑level load switching and fault isolation in rooftop and utility‑scale plants.
Battery Energy Storage Systems: Safe connection/disconnection of battery strings in BESS installations.
Industrial DC Drives: Motor drive isolation and control in manufacturing and process automation.
Charging Stations: Reliable switching for EV charging infrastructure and power electronics.
Marine & Offshore: Corrosion‑resistant, waterproof switches on vessels and platforms for renewable power.

Why Use a Combined Switch in Energy Storage?

Traditional setups require separate contactors, pre‑charge resistors, and isolation switches. A combined switch merges these into a single unit, reducing external wiring, minimizing failure points, and ensuring smoother DC load switching. Key benefits include faster commissioning, lower installation cost, and improved reliability in harsh conditions.

The DNRH8 Combined Switch is designed with system-level integration in mind. When paired with GRL’s high-conductivity copper busbars, it enables secure, low-resistance power transmission within battery racks or energy storage cabinets. The switch’s compact footprint and side-mounted terminals align perfectly with modular copper busbars, allowing quick bolt-on installation without excessive cabling. This integration reduces thermal stress and improves current distribution across multiple battery modules.

In addition, the DNRH8 is frequently used in combination with GRL’s DNESS Series Energy Storage Fuses. These high-current, high-breaking-capacity fuses (rated up to 1500VDC, 3000A) offer primary circuit protection, while the DNRH8 provides isolation and smart switching control. Together, they form a complete protection and disconnection solution for BESS systems, simplifying assembly, saving cabinet space, and enhancing operational safety.

This coordinated system—fuse + combined switch + copper connector—is ideal for:

Lithium-ion battery racks in containerized BESS
Cabinet-integrated PV+Storage solutions
Modular ESS units requiring plug-and-play architecture

For visual guidance, refer to product images in the brochure showing the DNRH8 mounted adjacent to fuse blocks and laminated copper bars, illustrating how GRL’s engineering supports standardized and efficient system integration.Get Quote

By adopting integrated switches like the DNRH8, engineers and system integrators unlock faster deployments, reduce wiring errors, and enhance safety, key drivers for today’s clean energy revolution.

Explore how a combined switch can simplify your next energy storage or PV project. Follow GRL Electric on LinkedIn for the latest in fuse protection solutions. Contact our sales team to discuss customization and pricing. Get Quote

FAQ

Q1: What makes a combined switch different from a standard DC isolator?
A1: A combined switch integrates pre‑charge, main switching, and undervoltage trip functions—standard isolators only open/close the circuit.

Q2: How does the IP67 rating benefit BESS installations?
A2: The IP67 enclosure prevents dust and water ingress, critical for outdoor cabinets and harsh environments.

Q3: Can I use a combined switch at high altitude?
A3: DNRH8 supports derating up to 5000 m altitude, maintaining 1500 V insulation and safe operation.

Q4: Is a remote control available?
A4: The DNRH8 offers 24 V remote activation and real‑time status feedback for integration with SCADA or BMS.