Overvoltage Protection Switch DC SINOTIMER OBS-41, Type 2, 1000VDC, 40kA, 2P

Technical Documentation

DC Overvoltage Protection Switch SINOTIMER OBS-41 1000VDC

Type 2 DC Overvoltage Protection Device

Product Identification

• Brand: SINOTIMER
• Model: OBS-41
• Type: SPD (Surge Protective Device)
• Configuration: 2 poles (+ / -)
• Protection Class: Type 2 (T2)
• Nominal DC Voltage (Uc): 1000 VDC
• Rated Discharge Current (In): 20 kA (8/20 µs)
• Maximum Discharge Current (Imax): 40 kA (8/20 µs)
• Protection Level (Up): 3.8 kV
• Compliance Standard: IEC 61643-1
• Applications: High voltage DC photovoltaic systems

General Description

The SINOTIMER OBS-41 1000VDC DC overvoltage protection switch is a protective device designed for DC circuits, primarily in photovoltaic systems with high voltages. Its purpose is to limit transient overvoltages caused by indirect lightning strikes or switching operations in DC installations. The device diverts pulsating overvoltages to ground, protecting sensitive equipment such as photovoltaic inverters and related electronic devices.

Visual Indicators and Operating Status

• Each unit features a visual status indicator. Green indicates normal operation and active protection.
• A change in color signals damage to the unit and the need for replacement.
• The indicator allows quick confirmation of status without additional tools.

Construction and Terminal Connections

• The device includes two SPD units for positive and negative polarity.
• The upper terminals are clearly marked with + and - symbols for connection to the DC circuit.
• The lower terminal is intended for connection to ground (PE).
• Connections are made via screw terminals, ensuring a secure and stable contact.

Protection Operation

The Type 2 SINOTIMER OBS-41 overvoltage protection switch limits transient overvoltages and reduces their level to a safe value for protected equipment, with a protection level Up of 3.8 kV. It is designed to withstand multiple lightning events within specified nominal and maximum current limits.

Key Electrical Parameters

• Maximum Continuous DC Voltage (Uc): 1000 VDC
• Rated Discharge Current (In): 20 kA (8/20 µs)
• Maximum Discharge Current (Imax): 40 kA (8/20 µs)
• Protection Level (Up): 3.8 kV
• Test Interference Type: 8/20 µs

Installation

• Standard mounting on 35 mm DIN rail
• Suitable for installation on DC photovoltaic panels or DC distribution boards
• Connect quickly and as close as possible to the inverter for maximum efficiency
• Recommended to mount as near as possible to the inverter for optimal performance

Application Areas

• On-grid and off-grid photovoltaic systems
• DC panels for solar lines up to 1000 V
• Protection of photovoltaic inverters
• Industrial DC installations
• Applications with transient overvoltage risk

Important Notes

• The device does not offer overcurrent or short circuit protection and does not replace circuit fuses or switches.
• Proper grounding connection is essential for effective protection operation.
• If the visual indicator signals damage, the unit must be replaced to maintain the level of protection.