Why Choose the Finder 7P.21.8.150.0015 Type 2 Surge Protection Device?
The Finder 7P.21.8.150.0015 is a compact, single-pole Type 2 surge protection device (SPD) designed to protect compatible low-voltage AC electrical installations against transient overvoltages. Part of the Finder Series 7P surge protection range, this DIN rail-mounted surge arrester uses metal oxide varistor technology to help safeguard industrial control equipment, electrical power supplies and sensitive electronic components against switching transients and induced lightning surges.
Designed for electrical systems with a nominal voltage of 120 V AC, the Finder 7P.21.8.150.0015 features a 150 V AC maximum continuous operating voltage (Uc), a 15 kA nominal discharge current (In) and a 40 kA maximum discharge current (Imax). Its 0.74 kV voltage protection level (Up) helps limit transient voltages reaching connected equipment when the SPD is correctly selected, installed and coordinated with the electrical system.
The device incorporates a replaceable varistor protection cartridge and a visual protection status indicator, allowing maintenance engineers to identify when the protective module requires replacement. Its compact 17.5 mm DIN rail format, IP20 protection rating and wide operating temperature range make it a practical solution for industrial automation panels, low-voltage distribution boards and electrical control cabinets.
Key Advantages
- Type 2 surge protection helps protect electrical equipment against switching transients and induced lightning surges.
- Single-pole configuration for compatible low-voltage AC installations.
- 150 V AC maximum continuous operating voltage for correctly specified electrical systems.
- 15 kA nominal discharge current provides robust surge-handling capability.
- 40 kA maximum discharge current supports protection against higher-energy transient events.
- 0.74 kV voltage protection level helps limit surge voltage reaching connected equipment.
- Metal oxide varistor technology provides rapid response to transient overvoltages.
- Replaceable varistor cartridge simplifies maintenance without requiring replacement of the complete SPD base.
- Visual protection status indicator enables straightforward inspection of the protective element.
- Compact 17.5 mm module width helps conserve space inside electrical enclosures.
- 35 mm DIN rail mounting supports convenient installation in standard control panels.
- −40 to +80 °C operating temperature range supports demanding industrial environments.
- IP20 ingress protection rating for installation within suitable electrical distribution equipment.
Key Features
- Finder Series 7P surge protection device.
- 7P.21 single-pole Type 2 SPD configuration.
- Metal oxide varistor (MOV) protection technology.
- 120 V AC nominal system voltage.
- 150 V AC maximum continuous operating voltage (Uc).
- 15 kA nominal discharge current (In) using an 8/20 µs waveform.
- 40 kA maximum discharge current (Imax) using an 8/20 µs waveform.
- 0.74 kV voltage protection level (Up).
- 0.6 kV protection level at 5 kA.
- Replaceable varistor protection module.
- Visual varistor status indication showing whether the protective element is serviceable or requires replacement.
- No integrated remote signalling contact on the 7P.21.8.150.0015 version.
- 35 mm DIN rail mounting in accordance with EN 60715.
- 17.5 mm nominal module width.
- IP20 protection rating.
- −40 to +80 °C ambient operating temperature range.
- Replaceable cartridge reference: Finder 7P.20.8.150.0015.
- IEC/EN 61643-11 surge protection device classification.
- Suitable for installation at the LPZ 1 / LPZ 2 boundary within a coordinated surge protection arrangement.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Surge Protection Devices
- Model: 7P.21.8.150.0015
- Product type: Type 2 surge protection device
- SPD classification: Type 2
- Number of poles: 1
- Protection technology: Metal oxide varistor (MOV)
- Nominal system voltage (Un): 120 V AC
- Maximum continuous operating voltage (Uc): 150 V AC
- Nominal discharge current (In): 15 kA (8/20 µs)
- Maximum discharge current (Imax): 40 kA (8/20 µs)
- Voltage protection level (Up): 0.74 kV
- Voltage protection level at 5 kA: 0.6 kV
- Response time: 25 ns
- Short-circuit current rating (Isccr): 50 kA, subject to specified installation conditions
- Maximum associated backup fuse: 160 A gL/gG, subject to manufacturer's coordination requirements
- Protection element: Replaceable varistor cartridge
- Replacement cartridge: Finder 7P.20.8.150.0015
- Local status indication: Visual varistor status indicator
- Integrated remote signalling contact: No
- Remote signalling version: Finder 7P.21.8.150.1015
- Mounting method: DIN rail
- DIN rail size: 35 mm
- DIN rail standard: EN 60715
- Module width: 17.5 mm nominal
- Installation space: 1 modular spacing unit
- Ingress protection: IP20
- Operating temperature: −40 to +80 °C
- Applicable standard: IEC/EN 61643-11
- Typical installation location: LPZ 1 / LPZ 2 boundary or higher protection zone
- EAN / GTIN: 8012823453576
Reliable Type 2 Surge Protection for Industrial Electrical Systems
Industrial electrical installations can experience transient overvoltages caused by switching operations, inductive loads, power network disturbances and lightning-related events. These short-duration voltage surges may damage electronic components, interrupt automated processes and reduce the reliability of connected electrical equipment. Correctly selected Type 2 surge protection devices help limit these transient voltages and reduce the risk of equipment damage.
The Finder 7P.21.8.150.0015 is designed for compatible 120 V AC electrical systems and provides a 150 V AC maximum continuous operating voltage. This makes it suitable for designated low-voltage AC applications where the surge protection device must be matched to the operating voltage of the electrical supply.
The SPD uses metal oxide varistor technology, which becomes conductive during a transient overvoltage and diverts surge current through the intended protective path. With a 15 kA nominal discharge current, 40 kA maximum discharge current and 0.74 kV voltage protection level, the device offers defined surge-limiting characteristics for properly designed electrical installations.
A practical feature of the Finder 7P.21.8.150.0015 is its replaceable varistor cartridge. The integrated visual indicator enables maintenance personnel to identify whether the protective element remains serviceable or requires replacement. When necessary, the cartridge can be replaced with the designated Finder 7P.20.8.150.0015 module while retaining the existing SPD base, provided the base remains in suitable working condition.
The device mounts onto a standard 35 mm DIN rail and occupies approximately 17.5 mm of panel width. It is intended for installation as part of a coordinated surge protection arrangement, typically at the boundary between lightning protection zones LPZ 1 and LPZ 2. Correct selection of the SPD, upstream protective devices, earthing arrangement and connection lengths is essential for effective protection.
Typical Applications
- Compatible 120 V AC electrical distribution systems.
- Industrial automation and PLC control cabinets.
- Electrical control panels and machine control systems.
- Low-voltage AC power distribution boards.
- Industrial instrumentation and monitoring equipment.
- Electronic control power supplies.
- Motor control and manufacturing equipment control panels.
- Industrial machinery and process control installations.
- Building services and electrical infrastructure.
- Electrical installations exposed to induced lightning surges.
- Equipment requiring protection against switching transients.
- DIN rail-mounted surge protection in compact electrical enclosures.
