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- Surge Protective Device
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- SB1 Control and Signalling ∅ 22 mm(fixing)
- SB2-E Plastic Control and Signalling ∅ 22mm(fixing)
- SB2-B Metal Control and Signalling ∅ 22mm(fixing)
- SAL-B Control stations and enclosures
- SB3 Control and Signalling ∅ 25、30mm(fixing)
- SB4 Metal Control and Signalling ∅ 22mm
- SB5 Plastic Control and Signalling ∅ 22mm
- SAL-D, K Control stations and enclosures
- SB6 Plastic Control and Signalling ∅ 16mm(fixing)
- SB8 Control and Signalling ∅ 22mm(fixing)
- SB9 Control and Signalling ∅ 22mm(fixing)
- SB10 Control and Signalling ∅ 22mm(fixing)
- AD58 signal indicator series φ16、22、25、30mm(fixing)
- BA9s series bulb with integral LED
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- 6 Ways Distribution Boxes A06 Series
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- 24 Ways Distribution Boxes A24 Series
- Control stations and enclosure
- Plug & Socket
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The type 2 surge protective device are applicable to discharge overvoltage caused by switch-type (8/20μs wave-form) over currents. The type 2 protective device must be installed into sub-distribution boards (at condominium into distribution boards of flats) after main distribution boards containing type 1 arresters.
For proper operation at least 10-15m cable or wire must be placed between type 1 and type 2 surge protective device . Otherwise a decoupling coil has to be installed between the two devices. These protectors are modular types with changeable insert; the auxiliary contact is built-in into the housing of the device.
For proper operation at least 10-15m cable or wire must be placed between type 1 and type 2 surge protective device . Otherwise a decoupling coil has to be installed between the two devices. These protectors are modular types with changeable insert; the auxiliary contact is built-in into the housing of the device.
| Howo code | Number of poles | W (mm) |
Nominal discharge (8/20μs) In |
Maximal discharge current (8/20μs) Imax |
Color | Type |
| WZU4-40T/3P-385V | 3P | 20kA | 40kA | grey | compact | |
| WZU4-30T/3P | 3P | 15kA | 30kA | grey | compact | |
| WZU4-20T/3P | 3P | 10kA | 20kA | grey | compact | |
| WZU4-40T/3+NPE-385V | 3P+N/PE | 20kA | 40kA | grey | compact | |
| WZU4-40T/4P-385V | 4P | 20kA | 40kA | grey | compact | |
| WZU4-30T/3P+NPE | 3P+N/PE | 15kA | 30kA | grey | compact | |
| WZU4-30T/4P | 4P | 15kA | 30kA | grey | compact | |
| WZU4-20T/3P+NPE | 3P+N/PE | 10kA | 20kA | grey | compact | |
| WZU4-20T/4P | 4P | 10kA | 20kA | grey | compact |
| Howo code | WZU4-40T | WZU4-30T | WZU4-20T |
| Rated voltage | 230V, 3x230/400V | ||
| Network system | TN, TT, IT | ||
| Highest continuous voltage (Uc) | 385/440V | 385V | 385/440V |
| Protection level (Up) | 1,8kV | 1,6kV | 1,5kV |
| Follow current limitation | 125A gG | ||
| Ambient temperature | -40 ℃ ... +55 ℃ | ||
| Type of terminal | elevator clamp | ||
| Integrated protection devices | Varistor, thermal fuse | ||
| Mounting | on 7.5 × 35 mm size mounting rail (EN 50022) | ||
| Auxiliary status contact | Integrated (1 pc NO contact) | ||
| Arresting signal | Red optical signal | ||
| Terminal capacity | solid: 6 - 35 mm² flexible: 6 - 25 mm² | ||
| Flammability of housing | UL94-V0 | ||
