Disconnect Switches for Renewable Energy Systems
Telergon DC disconnect switches provide load-break isolation for photovoltaic and selected high-voltage DC applications. The U.S. range includes heavy-duty UL 98B disconnects rated up to 1500 VDC and compact UL 508I disconnects rated at 1000 VDC. Products are also available with IEC 60947-3 ratings by series and model. Suitability for battery and energy-storage applications should be verified separately for the specific product and system.
Industry Profile
Telergon disconnect switches are used throughout renewable energy infrastructure, supporting safe operation, installation, and maintenance in:
- Solar PV combiner boxes and string inverters
- Battery energy storage systems (ESS)
- DC load centers and power conversion units
- Hybrid AC/DC power generation and microgrids
- DC maintenance isolators and emergency shutdown systems
Relevant product and system standards may include:
UL 98B: Applies to specific disconnect switches evaluated for photovoltaic-system applications
• UL 508I: Applies to specific photovoltaic disconnect switches, including the current F7 compact DC rangeUL 98C: Applies to switches specifically evaluated for energy-storage-system applications; do not assume UL 98C coverage unless the specific model is listed
IEC 60947-3: Applicable to many Telergon DC disconnect products used in international applications
NEC Article 690: May apply to photovoltaic-system installations
NEC Article 706: May apply to energy-storage-system installations
Project, utility, inverter, battery, or system-level requirements may impose additional conditions beyond the product certification
- DC Disconnect Switches (UL 98B, UL 98C)
- DC Compact Disconnect Switches
- AC/DC and DC/DC Changeover Switches
- Fuse Disconnect Switches
Renewable systems face outdoor exposure, fluctuating temperatures, and potential moisture or dust ingress. Telergon disconnects are designed for environmental durability with:
- NEMA / UL Type 3R, 4, 4X: Outdoor, watertight, and corrosion-resistant enclosures
- IP65 / IP66: Dust-tight and high-pressure water protection for rooftop and field installations
- UV-resistant materials suitable for exposed solar and battery cabinet environments
- ATEX and CE compliance where required for international renewable projects
- Compact design for integration into PV and ESS enclosures
- High breaking capacity for continuous DC load up to 1500 VDC
- Lockable and visible disconnect positions for operator safety
- Double-break contact design to suppress DC arcs
- Quick-mount options for inverter or panel integration
- Available in enclosed and open configurations for design flexibility
Related Product Categories
Frequently Asked Questions​
What certifications are required for DC disconnects in solar and energy storage applications?
Telergon renewable energy products are certified to UL 98B and UL 98C, meeting NEC 690 and NEC 706 requirements for PV and ESS installations. IEC 60947-3 certification ensures global compliance for DC isolation.
Can Telergon DC disconnects be used for both PV and battery systems?
Yes. Telergon DC disconnects are rated for both photovoltaic and energy storage applications, providing reliable isolation for 600, 1000, and 1500 VDC circuits.
What enclosure ratings are recommended for rooftop or outdoor renewable systems?
Outdoor installations typically require Type 4 or 4X enclosures or IP66-rated handles to resist dust, moisture, and UV exposure. Telergon products are available with corrosion-resistant, weatherproof components.
Why are DC-specific disconnects necessary in renewable systems?
DC circuits behave differently than AC, producing sustained arcs that require specially designed contacts and breaking mechanisms. Telergon DC disconnects use arc-suppression designs and high breaking capacity for safe, repeatable isolation.