VOLTAGE SURGE PROTECTION DEVICES TYPE 2 & 3: Imax 40KA 8/20µs

Modular voltage protection devices, Type 2 & 3 8/20µs, 40KA compliant to the latest standards, developed to protect against the effects of indirect lightning strikes and resultant induced voltages and surges.

The units are suitable for AC single phase (2 pole device), or three phase (4 pole device) 3 wire or 4 wire. If a Neutral is present, it must be protected. Wiring is in parallel, therefore there is no maximum current limitations and in theory no discrimination fusing or MCB protection is required. However, within the UK to comply with BS7671 wiring regulations 534.4.5 and 534.4.5.2 it is required that back up discrimination fusing, or an MCB is utilised, a 32 Amp MCB is recommended.

Both device types have a front mechanically driven flag indicator, green for healthy and red for fault. Additionally there is also a mechanically driven auxiliary C/O output contact, useful say as an alarm input into a BMS or PLC system. There being a healthy output status (between terminals 2 & 3), but also in the event of an MOV failing due to an intense or multiple surges the output contact will change state (between terminals 2 & 1), also indicated by a red flag on the failed MOV or MOV’s. In this state protection has been lost, the unit will need replacing. A feature of these units is the MOV modules are plug in and can be replaced without disconnecting the unit or isolating the system.

Complies with: BSEN61643-11, BSEN62305 & BS7671

Protection via: High energy MOV’s (Metal Oxide Varistors)

Nominal discharge current: 20KA

Max discharge current: 40KA

Max AC continuous voltage: 275V L-N/L-E

Response time: <25n Sec

Thermal protection: Yes

Operating temperature: -40°C to +80°C

Discrimination fusing / MCB: Single pole 32 Amp MCB advised to comply with BS7671, or Three pole 32 Amp MCB advised to comply with BS7671

Recommended cable size: 6mm² – 25mm²

Output contact rating: 250VAC / 0.5 Amps, AC1

TYPE

FOX.SPD2.2 Two pole type 2 surge protection device, 40KA 8/20µs
FOX.SPD2.4 Four pole type 2 surge protection device, 40KA 8/20µs

Regulation 443.4.1
Protection against transient over voltages shall be provided where the consequences caused by over voltage could:-

i). Result in serious injury to, or loss of human life, or
ii). Result in failure of a safety service, as defined in Part 2, or
iii). Result in significant financial loss or data loss

For all other cases Surge Protection Devices shall be fitted to protect against transient over voltages, unless the owner of the installation declines such protection and wishes to accept the risk of damage to both wiring and equipment as tolerable.

Regulation 534.4.5
Protection of the Surge Protection Device against over current.

Surge Protection Device installations shall be protected against over current. This can be done with an MCB or a fuse.

Regulation 534.4.5.2
Arrangement of the Surge Protection Device with relation to over current protection.

In the case of an Over Current Protection Device operation arising from a Surge Protection Device failure, the continuity of supply must not be affected.

T Terra (Earth)
N Connection to Earth is via the supply network
C Stands for combined in relation to the Neutral and the Earth
S Stands for separate in relation to the Neutral and the Earth

Therefore TNC-S denotes a setup where the supply side of the system uses a combined Neutral and Earth conductor for Earthing.
The load side of the system uses a separate conductor for Earth and Neutral.

Therefore TN-S denotes a setup where the supply side of the system uses separate Neutral and Earth conductors, as does the load side.

PE Protective Earth
SPD Surge protection device
MOV Metal oxide varistors