AC Surge Protective Device T2 Class C Type 2, Class II SLP40 series

Transient and power frequency overvoltage protection
Surge protection devices (SPD) Electrical power supply networks to IEC/EN (DIN rail)
Type 2 / Class C / Class II for use in AC power supply systems

Surge protection portfolio includes solutions for protecting systems up to 1,000 V a.c. against surges caused by atmospheric discharge and switching operations.

Type 2 / Class II
Ability to discharge induced voltage surges (8/20 μs). Suitable for the second level of protection in supply distribution panels in which Type 1 protectors are installed, or for the first level of protection for applications not exposed to direct strikes and with no external lightning protection system. EN 61643-11 / IEC 61643-11.

LSP is the line of AC power surge protectors is designed to cover all possible configurations in low voltage installations. They are available in many versions, which differ in:
  • – AC Surge Protective Device T2
  • – AC network configuration (Single/3-Phase)
  • – Discharge currents (Iimp, Imax, In)
  • – Protection technology (varistors, GDT)
  • – Features (plug-in, remote signaling, compact)

The AC Surge Protective Device T2 Class C SLP40 line is a group of Class II Surges Protective Devices. They are intended as a protection against transient overvoltage caused by fast switching operations or indirect hits of lightning strokes (residuum effects).

It is recommended to install Class II SPDs every 10 – 20 meters of cable length repetitively, typically to main and sub-distribution boards. The SLP40-440 are designed for direct coordination with Class I SPDs of line FLP25. In the case of SLP40-275, the coordination with the line FLP25 is done by means of 10 m cable length.

The design of AC Surge Protective Device T2 is based on Metal Oxide Varistors. Such a design provides a very low response time. The modular design with plug-in inserts allows simple and quick replacement of function modules in case of MOV is beyond if its lifespan due to often occurrence of overvoltage peaks.

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General parameters
Suitable for protection of electrical installations against transient overvoltage
Plug-in module design
Indication window helps users to know the status of device
Optional remote-signaling contact
Electrical parameters

1+0, 2+0, 3+0, 4+0, 1+1, 2+1, 3+1

(L-N/PE/PEN connection)

1+1, 2+1, 3+1

(X+1 N-PE connection)

SPD according to

EN 61643-11 / IEC 61643-11

Type 2 / Class II
TechnologyMOV (Varistor)GDT (Spark-gap)
Nominal a.c. voltage Un60 V AC   ①120 V AC  ②230 V AC  ③230 V AC
230 V AC  ④230 V AC  ⑤400 V AC  ⑥
480 V AC  ⑦690 V AC  ⑧900 V AC  ⑨
Max. continuous operational voltage Uc75 V AC  ①150 V AC  ②275 V AC  ③255 V AC
320 V AC  ④385 V AC  ⑤440 V AC  ⑥
600 V AC  ⑦750 V AC  ⑧1000 V AC  ⑨
Nominal frequency f50 / 60 Hz
Nominal discharge current In (8/20 μs)20 kA
Max. impulse current Iimp (10/350 μs)12 kA
Max discharge current Imax (8/20 μs)40 kA
Voltage protection level Up0.4 kV  ①1.0 kV  ②1.5 kV  ③1.5 kV
1.6 kV  ④1.8 kV  ⑤2.0 kV  ⑥
2.5 kV  ⑦2.6 kV  ⑧4.2 kV  ⑨
Voltage protection Up at 5 kA (8/20 μs)≤ 1 kV
Follow current extinguishing capability Ifi100 Arms
Temporary overvoltage (TOV) (UT )

– Characteristic (withstand)

90 V / 5 sec  ①180 V / 5 sec  ②335 V / 5 sec  ③1200 V / 200 ms
335 V / 5 sec  ④335 V / 5 sec  ⑤580 V / 5 sec  ⑥
700 V / 5 sec  ⑦871 V / 5 sec  ⑧1205 V / 5 sec  ⑨
Temporary overvoltage (TOV) (UT ) – Characteristic (safe failure)115 V / 120 min  ①230 V / 120 min  ②440 V / 120 min ③
440 V / 120 min  ④440 V / 120 min  ⑤765 V / 120 min  ⑥
915 V / 120 min  ⑦1143 V / 120 min  ⑧1205 V / 120 min  ⑨
Residual current at Uc IPE≤ 1 mA
Response time ta≤ 25 ns≤ 100 ns
Max. mains-side over-current protection125 A gL/gG
Short-circuit current rating ISCCR25 kArms
Number of ports1
Type of LV systemTN-C, TN-S, TT (1+1, 3+1)
Remote contact (optional)1 changeover contact
Remote signalling alarming mode

Normal: closed;

Failure: open-circuit

The prospective short-circuit current

according to 7.1.1 d5 of IEC 61643-11

5 A
Protection functionOvercurrent
Remote contact op. voltage / current

AC Umax / Imax

DC Umax / Imax

250 V AC / 0.5 A

250V / 0.1 A; 125 V / 0.2 A; 75 V / 0.5 A

Mechanical parameters
Device length90 mm
Device width18, 36, 54, 72 mm
Device height67 mm
Method of mountingfixed
Operating state / fault indicationgreen / red
Degree of protectionIP 20
Cross-sectional area (min.)1.5 mm2 solid /flexible
Cross-sectional area (max.)35 mm2 stranded / 25 mm2 flexible
For mounting on35 mm DIN rail acc. to EN 60715
Enclosure materialthermoplastic
Place of installationinstallation indoor
Range of operating temperatures Tu-40 °C … +70 °C
Atmospheric pressure and altitude80k Pa … 106k Pa, -500 m … 2000 m
Humidity range5% … 95%
Cross-sectional area for remote

signalling terminals

max. 1.5 mm2 solid / flexible


Q1: Selection of surge protector

Al: The grading of the surge protector (commonly known as lightning protection) Is assessed according to the IEC61024 subdivision lightning protection theory, which is installed at the junction of the partition. Technical requirements and functions differ. The first-stage lightning protection device is installed between the 0-1 zone, high for the flow requirement, the minimum requirement of EN 61643-11 / IEC 61643-11 is 40 ka (8/20), and the second and third levels are installed between the 1-2 and 2-3 zones, mainly to suppress the overvoltage.

Q2: Are you a lightning surge protectors factory or lightning surge protectors trading company?

A2: We are a lightning surge protectors manufacturer.

Q3: Warranty and services:

A3:1. Warranty 5 years

2. lightning surge protectors products and accessories have been tested 3 times before ship out.

3. We own the best after-sale service team, if any problem happens, our team will do our best to solve it for you.

Q4: How can I get some lightning surge protectors samples?

A4: We are honored to offer you lightning surge protectors samples, pis contact our staff, and leave detailed contact information, we promise to keep your information confidential.

Q5: Is the sample available and free?

AS: Sample is available, but the sample cost should be payable by you. The cost of the sample will be refunded after further order.

Q6: Do you accept customized order?

A6: Yes, we do.

Q7: What’s the delivery time?

A7: It usually takes 7-15days after confirming payment, but the specific time should be based on the order quantity.

Packaging & Shipping

Packaging & Shipping

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