Disassembling various brand T1+T2, Class B+C, Class I+II, Iimp 25kA surge protective device SPD

 1. Dehn (Germany)

Dehn lightning current and surge arrester DV M TT 2P 255 FM T1+T2, Class B+C, Class I+II surge protective device SPD

Dehn DV M TT 2P 255 FM part no. 951 115

Basic circuit diagram Dehn DV M TT 2P 255 FM

Dehn DV M TT 2P 255 FM part no. 951 115 pic1

Dehn DV M TT 2P 255 FM part no. 951 115 pic2

Type: DV M TT 2P 255 FM, Part No.: 951115

  • Prewired combined spark-gap-based lightning current and surge arrester, consisting of a base part and plug-in protection modules
  • Maximum system availability due to RADAX Flow follow current limitation
  • No tripping of 20 A gL/gG fuses up to 50 kArms short-circuit currents
  • Lightning current discharge capacity: 50 kA (10/350 µs)
  • Allows for protection of terminal equipment
  • Fault indication by red mark in the inspection window
  • Easy exchange of protection modules by module locking system with releasing the button

Modular combined lightning current and surge arrester for protecting single-phase TT and TN systems (“1+1” circuit) against surges

SPD according to EN 61643-11 / IEC 61643-11type 1 + type 2 / class I + class II
Energy coordination with terminal equipment (<10 m)type 1 + type 2 + type 3
Nominal voltage (a.c.) (UN)230 V (50 / 60 Hz)
Max. continuous operating voltage (a.c.) [L-N] (UC)264 V (50 / 60 Hz)
Max. continuous operating voltage (a.c.) [N-PE] (UC (N-PE))255 V (50 / 60 Hz)
Lightning impulse current (10/350 μs) [L+N-PE] (Itotal)50 kA
Lightning impulse current (10/350 μs) [L-N]/[N-PE] (Iimp)25 / 50 kA
Nominal discharge current (8/20 μs) [L-N]/[N-PE] (In)25 / 50 kA

Dehn DV Series 255 V ac Maximum Voltage Rating 100kA Maximum Surge Current Lightning Arrester, DIN Rail Mounting

Dehn DV Series 255 V ac Maximum Voltage Rating 100kA Maximum Surge Current Lightning Arrester, DIN Rail Mounting

Basic circuit diagram DV M TT 255 FM

Type: DV M TT 255 FM, Part No.: 951315

SPD according to EN 61643-11 / IEC 61643-11type 1 + type 2 / class I + class II
Energy coordination with terminal equipment (≤ 10 m)type 1 + type 2 + type 3
Nominal voltage (a.c.) (UN)230 / 400 V (50 / 60 Hz)
Max. continuous operating voltage (a.c.) [L-N] (UC)264 V (50 / 60 Hz)
Max. continuous operating voltage (a.c.) [N-PE] (UC (N-PE))255 V (50 / 60 Hz)
Lightning impulse current (10/350 μs) [L1+L2+L3+N-PE] (Itotal)100 kA
Lightning impulse current (10/350 μs) [L-N]/[N-PE] (Iimp)25 / 100 kA
Nominal discharge current (8/20 μs) [L-N]/[N-PE] (In)25 / 100 kA

Dehn 255 V ac 100kA DV Lightning Arrester, DIN Rail Mounting

Dehn DV M TNS 255 (951 400)

Basic circuit diagram DV M TNS 255

Type: DV M TNS 255, Part No.: 951400

SPD according to EN 61643-11 / IEC 61643-11type 1 + type 2 / class I + class II
Energy coordination with terminal equipment (≤ 5 m)type 1 + type 2 + type 3
Nominal voltage (a.c.) (UN)230 / 400 V (50 / 60 Hz)
Max. continuous operating voltage (a.c.) (UC)264 V (50 / 60 Hz)
Lightning impulse current (10/350 µs) [L1+L2+L3+N-PE] (Itotal)100 kA
Lightning impulse current (10/350 µs) [L, N-PE] (Iimp)25 kA
Nominal discharge current (8/20 µs) [L/N-PE]/[L1+L2+L3+N-PE] (In)25 / 100 kA

2. Phoenix (Germany)

Phoenix lightning current and surge arrester T1+T2, Class B+C, Class I+II surge protective device SPD

FLT-SEC-P-T1-1S-264-50-FM

Phoenix FLT-SEC-P-T1-1S-350-25-FM

Phoenix surge protection FLT-SEC-P-T1-1S-350-25-FM, order no. 2905415 pic1

Phoenix surge protection FLT-SEC-P-T1-1S-35025-FM, order no. 2905415 pic2

Surge protection for the power supply
Combination type 1/2 protective device – FLT-SEC-P-T1-1S-350/25-FM, order no. 2905415

  • Spark gap has no line follow current
  • Free of leakage current, suitable for use in the pre-meter area
  • The high continuous voltage of 350 V AC for 230/400 V AC networks with high voltage` fluctuations
  • Pluggable
  • Low voltage protection level of 1.5 kV
  • Optical, mechanical status indicator
  • With floating remote indication contact

IEC test classificationI / II , T1 / T2
Nominal voltage UN240 V AC (TN-S)

240 V AC (TT)

Mode of protectionL-N / L-PE / N-PE
Maximum continuous operating voltage UC350 V AC
Impulse discharge current Iimp (10/350) μs25 kA / 25 kA / 100 kA
Nominal discharge current In (8/20) μs25 kA / 25 kA / 100 kA
Max. discharge current Imax (8/20) μs50 kA

3. Raycap (Germany) & Iskra Zascite (Slovenia)

Lightning and overvoltage protection Class I Class II Type 1 Type 2 Type 4CA

Raycap Lightning and Overvoltage Protection 25 kA Series ProTec T1HS 3+1

Lightning and Overvoltage Protection 25 kA Series ProTec T1HS 3+1 Circuit diagram

Raycap T1+T2 surge arrester ProTec T1HS-300-3+1-R Order Code 590307

Type: ProTec T1HS-300-3+1-R, Order Code: 59.0307

  • Location of Use: Main Distribution Boards
  • Network Systems: TT, TN-S
  • Mode of Protection: L-N, N-PE
  • IEC/EN/UL Category: Class I+II, Type 1+2, Type 4CA
  • Technology: Hybrid
  • Leakage Current Free: Yes
  • Housing: Pluggable Design
  • Compliance: IEC 61643-11: 2011; EN 61643-11: 2012; UL 1449 4th Edition

Nominal AC Voltage (50/60Hz) Uo / Un240 V
Maximum Continuous Operating Voltage (AC) (L-N) / (N-PE) Uc300 V / 305 V
Nominal Discharge Current (8/20 μs) (L-N) / (N-PE) In25 kA / 100 kA
Maximum Discharge Current (8/20 μs) (L-N) / (N-PE) Imax65 kA / 130 kA
Impulse Discharge Current (10/350 μs) (L-N) / (N-PE) Iimp25 kA / 100 kA
Sprcific Energy (L-N)/(N-PE) W/R156.2kJ/Ω/2500kJ/Ω
Charge (L-N) / (N-PE) Q12.5 As / 50 As
Voltage Protection Level (L-N) / (N-PE) Up1500 V / 1500 V
Rated Load Current IL100 A
Response Time (L-N) / (N-PE) tA< 100 ns / < 100 ns
Overcurrent Protection (max)315 A gG
Short-Circuit Current Rating (AC) ISCCR50 kA
Follow Current Interrupt Rating (N-PE) Ifi100 ARMS
TOV Withstand 120min (L-N) UT442 V
TOV Withstand 200ms (N-PE) UT1200 V
Number of ports1
Maximum Continuous Operating Voltage (AC) (L – N) / (N – G) MCOV300 V / 305 V
Measured Limiting Voltage (L – N) / (N – G) MLV1280 V / 1000 V
Nominal Discharge Current (8/20 μs) (L – N) / (N – G) In20 kA
Operating Temperature Range Ta-40 oF to +185 oF [-40 oC to +85 oC]
Permissible Operating Humidity RH5%…95%
Altitude13123 ft [4000 m]
Terminal Screw Torque Mmax39.9 Ibf·in [4.5 Nm]
Conductor Cross Section (max)2 AWG (Solid, Stranded) / 4 AWG (Flexible)
35 mm2 (Solid, Stranded) / 25 mm2 (Flexible)
Mounting35 mm DIN Rail, EN 60715
Degree of ProtectionIP 20 (built-in)
Housing MaterialThermoplastic: Extinguishing Degree UL 94 V-0
Thermal ProtectionYes
Operating State / Fault IndicationGreen Flag / Not Green Flag
Remote Contacts (RC)Optional
RC Switching CapacityAC: 250 V / 1A, 125 V / 1 A; DC: 48 V / 0.5 A, 24 V / 0.5 A, 12 V / 0.5 A
RC Conductor Cross Section (max)16 AWG (Solid) / 1.5 mm2 (Solid)

4. Citel (France)

Type 1+2+3 AC Surge Protector DS250VG series

Citel T1+T2+T3 surge protection device SPD DS250VG-300 Part number 2577 pic1

DS250VG-300DE Type 1+2 AC surge protector 1 pole

Citel T1+T2 surge protective device SPD DS250VG-300 Part number 2577 pic2

CITEL Model: DS250VG-300, Part number: 2577

  • Type 1 + 2 + 3 Surge protector
  • 25 kA on 10/350 μs impulse
  • Low voltage UP
  • Internal disconnection, status indicator and remote signaling
  • Optimized to TOV
  • IEC 61643-11 and EN 61643-11 compliance
  • UL 1449 ed. 4 recognition

DescriptionType 1+2+3 AC surge protector one-pole
Network230/400 V
Max. AC operating voltage (UC)255 Vac
Temporary Over Voltage (TOV) Charasteristics – 5 sec. (UT)335 Vac withstand
Temporary Over Voltage (TOV) Charasteristics – 120 mn (UT)440 Vac withstand
Residual current – Leakage current at Uc (Ipe)None
Max. Load current (if connection serie) (IL)100 A
Follow current (If)None
Nominal discharge current – 15 x 8/20 µs impulses (In)30 kA
Max. discharge current -max. withstand @ 8/20 µs by pole (Imax)70 kA
Impulse current by pole – max. withstand 10/350µs (Iimp)25 kA
Specific energy by pole (W/R)156 kJ/ohm
Withstand on Combination waveform – Class III test (Uoc)20 kV
Protection level @ In (Up-in)1.1 kV
Protection level (Up)1.5 kV
Admissible short-circuit current (Isccr)50000 A
Thermal disconnectorinternal
FusesFuses type gG – 315 A
Installation ground fault breakerType <> or delayed
Dimensionssee diagram
Connection to NetworkBy screw terminals : 6-35 mm2 / by bus
Disconnection indicator1 mechanical indicator
Remote signaling of disconnectionoutput on changeover contact
MountingSymmetrical rail 35 mm (EN60715)
Operating temperature-40/+85°C
Protection ratingIP20
Housing materialThermoplastic UL94-V0
Standards complianceIEC 61643-11 / EN 61643-11 / UL1449 ed.4
CertificationUL / CSA / EAC
Part number2577

5. Saltek (Czech)

OEM for Schneider, let’s take Schneider’s sample for example.

SPD Type 1 – Lightning Current Arrester FLP-25-T1-V(S)-3+1, ordering number.: A05305

FLP-25-T1-V(S)-3+1 ordering number A05305

Basic circuit diagram FLP-25-T1-V(S)-3+1 ordering number A05305

Lightning Current Arrester FLP-25-T1-V(S)-3+1, ordering number. A05305

Saltek Lightning Current Arrester FLP-25-T1-V(S)-3+1 ordering number A05305

pluggable module, visual fault signalling, module locking

  • combination of three-pole high performance lightning current arrester and encapsulated efficiency spark gap, connected in the 3+1 mode
  • installation at the boundary of zones LPZ 0 and LPZ 1 or higher, mainly to main distribution boards
  • for protection against impact of direct or indirect lightning strikes in wide range of applications – houses, office and industrial buildings
  • coordination with SPD Type 2 (SLP-275 V) even without surge separating inductors
  • optional remote fault signalling (S)
  • no leakage current

Nominal voltage Un230 V AC
Maximum operating voltage L-N Uc260 V AC
Maximum operating voltage N-PE Uc255 V AC
Nominal load current for “V” connection IL125 A
Lightning impulse current (10/350 μs) L-N Iimp25 kA
Lightning impulse current (10/350 μs) N-PE Iimp100 kA
Voltage protection level mode L-N Up1,5 kV
Voltage protection level mode N-PE Up1,5 kV
Voltage protection level mode L-PE Up2,2 kV
Ability to independently switch off the following current N-PE Ifi0,1 kA
Short-circuit current rating ISCCR50 kA
Maximum overcurrent protection250 A gL/gG
Maximum overcurrent protection for “V” connection125 A gL/gG
Response time L-N ta100 ns
Response time N-PE ta100 ns
Cross-section of connected conductors solid (min/max)2,5 mm2 / 50 mm2
Cross-section of connected conductors stranded (min/max)2,5 mm2 / 35 mm2
Fault indication L-Nred indication field
Fault indication N-PEno
Remote indicationpotential-free change-over contact
Remote indication contacts250V/0,5A AC,250V/0,1A DC
Cross-section of remote indication conductors1,5 mm2
Degree of protectionIP 20
Range of operating temperatures (min/max)-40 °C / 80 °C
MountingDIN rail 35 mm
According to standardEN 61643-11:2012, IEC 61643-11:2011 / T1

 6. Weidmuller (Germany)

Weidmuller lightning arrester VPU I 1+1-R LCF 280V / 25kA (Order no. 1351740000)

Weidmuller lightning arrester VPU I 1+1-R LCF 280V 25kA

Basic circuit diagram Weidmuller VPU I 1+1-R LCF 280V-25kA

Weidmuller lightning arrester VPU I 1+1-R LCF 280V 25kA Order no. 1351740000

  • Type I/II lightning arrester for use upstream of the electrical meter
  • With 25 kA (10/350 µs) suitable for protective zones I, II, III and IV (LPL I/II/III/IV)
  • With remote monitoring function, one changeover contact
  • Tested according to IEC 61643-11 for type I and II surge protection
  • Pluggable arrester

TypeVPU I 1+1 R LCF 280V/25KA
Order No.1351740000
VersionSurge voltage arrester, Low voltage, with remote contact, Leakage-current-free, Single-phase, IT with N, IT without N, TN
Rated voltage (AC)230 V
Voltage typeAC
Max. continuous voltage, Uc (AC)280 V
Max. continuous voltage, Uc (N-PE)260 V
Low voltage networkSingle-phase, IT with N, IT without N, TN
Discharge current In (8/20µs) N-PE100 kA
Discharge current Imax (8/20µs) N-PE100 kA
Discharge current In (8/20µs) wire-PE25 kA
Discharge current Imax (8/20µs) wire-PE100 kA
Lightning test current Iimp (10/350 µs) (L-PE)25 kA
Lightning test current, Iimp (10/350 µs) (N-PE)100 kA
Frequency range, max.60 Hz
Frequency range, min.50 Hz
FuseNo Fuse neccessary ≤250 A gG, 250 A gL (if back up fuse > 250 A)
Short-circuit current rating (ISCCR)25 kA
Follow-on current extinguishing capability IfiNot available due for technical reasons
StandardsIEC61643-11, EN61643-11
Energy coordination (≤10 m)Type I, Type II, Type III
Protection level Up at IN (L/N-PE)≤ 1.6 kV
Protection level Up at IN (N-PE)≤ 1.6 kV
Leakage current at Un1 µA
Temporary surge voltage (over-voltage) – TOV438 V
Number of poles1
Rated load current IL125 A
Requirements category acc. to IEC 61643-11Type I, Type II
Requirements class, acc. to EN 61643-11T1, T2
Response time≤ 100 ns
Signalling contact250 V 1A 1CO
Suitable forCount-in installation (leakage current free)

Primary analysis result:

Dehn and Phoenix use the encapsulated spark gap to make T1(T1+T2) SPD.

Raycap, Citel, Saltek and Weidmuller use high energy varistors plus gas discharge tube (GDT) to make T1(T1+T2) SPD.