DEHN DEHNguard DG M TT 275 Type 2 Surge Protection Device, 4 Module Three Phase TT
- Brand:
- DEHN
- Part number:
- 952310
- EAN:
- 4013364108479
Four-module Type 2 surge arrester for three-phase TT and TN-S systems, using a 3+1 circuit with an N-PE spark gap. Prewired with pluggable protection modules.
- Type 2 protection, three-phase TT and TN-S
- 3+1 circuit with N-PE spark gap
- In 20kA, Imax 40kA, UP 1.25kV
- Four DIN modules, prewired
- Pluggable protection modules
6 in stock
UK delivery £9.95 ex VAT, free on orders of £100 ex VAT or more; usually 2-3 working days.
Minimum order £50 ex VAT. All prices exclude VAT, which is added at checkout.
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Specifications
Electrical
| Supply | Three phase |
|---|---|
| Earthing system | TT, TN-S, TN-C-S (PME) |
| Earthing system (as supplied) | TT/TN |
| Remote signalling contact | No |
| Application | Mains AC |
Protection
| SPD type | Type 2 |
|---|---|
| Nominal discharge current (In) | 20 kA |
| Max discharge current (Imax) | 40 kA |
| Voltage protection level (Up) | 1.25 kV |
Dimensions
| DIN rail width | 4 modules |
|---|
Construction
| Replaceable protection module | Yes |
|---|
Fit
| Mounting | DIN rail |
|---|
Identification
| Brand | DEHN |
|---|---|
| Part number | 952310 |
| EAN | 4013364108479 |
| Range | DEHNguard |
More technical data
| Manufacturer | DEHN (DEHNguard modular, type DG M TT 275) |
|---|---|
| SPD class | Type 2 to EN 61643-11 / Class II to IEC 61643-1 |
| Nominal a.c. voltage (UN) | 230/400V; UC 275V (L-N), 255V (N-PE) |
| Nominal discharge current In (8/20) | 20kA; max discharge current Imax: 40kA |
| Lightning impulse current N-PE (10/350) Iimp | 12kA |
| Voltage protection level UP | 1.25kV (L-N), 1.5kV (N-PE); 1kV at 5kA |
| Follow current extinguishing capability N-PE | 100Arms; max backup fuse 125A gL/gG |
- Width 4 modules (DIN 43880), IP20, 35mm DIN rail to EN 60715, -40 to +80C
Product details
Three-phase TT installations call for the 3+1 arrangement: a varistor on each line to neutral and a spark gap from neutral to earth. The DEHNguard DG M TT 275 packages that into four prewired DIN modules, carrying a 20kA nominal discharge current per phase and a 12kA lightning impulse rating on the N-PE path.
Key features
- 3+1 circuit suits three-phase TT systems as well as TN-S installations
- Prewired complete unit, ready to land on 230/400V incoming conductors
- Pluggable protection modules replaced individually, wiring left untouched
- Thermo Dynamic Control monitoring for safe disconnection of a failing varistor
- N-PE spark gap with 100Arms follow current extinguishing capability
Typical applications
Fit it at the main or sub-distribution board of three-phase installations with an electrode earth: farms and rural estates, water and wastewater pumping, quarries and outdoor process plant, telecom and broadcast compounds, and temporary building supplies. On TN-S systems the same unit covers three-phase panel boards, machinery supplies and sub-mains feeding drives, controls and IT.
Compliance
Tested as a Type 2 device to EN 61643-11 and Class II to IEC 61643-1, with KEMA, VDE, UL and VdS approvals, a UL 94 V-0 enclosure and IP20 protection. BS 7671 requires the risk from transient overvoltages to be assessed and coordinated protection provided where the consequences justify it.
Order today for fast UK dispatch on genuine DEHN surge protection at trade-direct prices.
