DC Switch / Isolator

Product Specifications

Technical details and manufacturing context for DC Switch / Isolator

Definition

The DC Switch / Isolator is a manually operated switching device used in the DC Input Section of electrical systems. Its primary function is to provide a safe and reliable means to completely disconnect DC power from downstream equipment, ensuring that maintenance or service work can be performed without risk of electric shock. When the switch is in the OFF position, it creates a visible air gap between the contacts, which serves as a clear indication that the circuit is de-energized and prevents accidental re-energization. This visible isolation is a critical safety feature, as it allows technicians to visually confirm that the circuit is open before proceeding with work. The device is designed for use in industrial environments and is available in a range of configurations to suit different voltage and current requirements. Key parameters include a rated voltage of 600–1500 V DC, a rated current of 16–2500 A, and a short-circuit withstand of 10–100 kA. The switch is constructed with copper alloy contacts, a thermoset plastic housing, and silver plating to ensure reliable performance and durability. It complies with IEC 60947-3 for switch-disconnectors and IEC 60947-1 for general requirements, and offers degrees of protection from IP54 to IP65. The operating temperature range is -40°C to 85°C, with current derating above 40°C. The device is available with various terminal types (M8–M20) and weighs between 0.5 and 25 kg, depending on the current rating. For specific applications, it is essential to verify model-specific values and standards with the legal manufacturer or supplier, as the listed ranges are for reference only.

Working Principle

The DC Switch / Isolator operates by mechanically opening or closing electrical contacts to establish or break the DC circuit path. When the switch is turned to the OFF position, the contacts separate, creating a physical air gap that provides visible isolation. This air gap ensures that the circuit is visibly open, preventing accidental re-energization during maintenance. The switch is manually operated, allowing the user to control the connection state. The contact gap is designed to handle the rated voltage, with higher voltages requiring larger gaps. The switch is rated for a certain number of mechanical and electrical operations, ensuring reliable performance over its service life.

Common Materials

Copper alloy contacts, Thermoset plastic housing, Silver plating

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	600–1500 V DC	Higher voltage requires larger contact gap.IEC 60947-3
Rated Current	16–2500 A	Continuous current at 40°C ambient.IEC 60947-3
Short-Circuit Withstand	10–100 kA	Peak withstand for 1s.IEC 60947-3
Contact Resistance	≤0.5 mΩ	Measured after 100 operations.
Mechanical Endurance	10000–30000 cycles	No load operations.IEC 60947-3
Electrical Endurance	1500–6000 cycles	At rated current and voltage.IEC 60947-3
Operating Temperature	-40–85 °C	Derate current above 40°C.IEC 60947-1
Degree of Protection	IP54–IP65	IP65 for outdoor use.IEC 60529
Pollution Degree	3	Industrial environment.IEC 60664-1
Insulation Voltage	1000–2000 V	Rated impulse withstand.IEC 60947-1
Terminal Type	M8–M20	Bolt size for cable lug.
Weight	0.5–25 kg	Depends on current rating.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Contact Assembly
Creates and breaks electrical connection between terminals

Material: Copper alloy with silver plating
Operating Handle Part
Manual control mechanism for switching operations

Material: Thermoplastic
Arc Chamber
Contains and extinguishes arcs during switching operations

Material: Arc-resistant thermoset plastic
Terminal Blocks
Connection points for incoming and outgoing DC cables

Material: Copper alloy

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for DC Switch / Isolator.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

DC Input Section

View system integration details

Manufacturers of DC Switch / Isolator

5 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

CHYT

Zhejiang, CN

120 staff

Also makes: Surge Protection Device, Energy Meter, Feed Box and 5 more