AC SPDs T2+T3 SLP20 series

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AC Surge Protection Device SPD T2+T3 SLP20 series

Transient and power frequency overvoltage protection
Surge protection devices (SPD) Electrical power supply networks to IEC/EN (DIN rail)
T2+T3 / Class C+D / Class II+III 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.

The AC Surge Protection Device SPD T2+T3 SLP20 line is a group of Class III Surge Protective Devices. They are intended as fine protection against transient overvoltage, installed downstream to Class II SPDs. The application field of SLP20 is the protection of sensitive electronics used in or close to distribution board, typically home automation, IT systems etc. The Y connection of functional elements provides balanced protection of L and N conductor towards PE thanks to identical MOVs for both working conductors and full isolation due to connection to PE via Spark Gap.

Class III SPDs should be installed maximum 5 meters from the protected device. Coordination with Class II SPDs SLP20 is defined also for near installation. To reach best parameters, it is recommended to install both classes with a mutual distance of 5 meters of connecting cables.

The design of AC Surge Protection Device SPD T2+T3 SLP20 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.

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

(N-PE connection)

SPD according to

EN 61643-11 / IEC 61643-11

Type 2+3 / Class II+ III
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)10 kA
Max discharge current Imax (8/20 μs)20 kA
Open circuit voltage (1.2/50 μs) Uoc10 kV
Voltage protection level Up≤ 0.3 kV  ①≤ 0.6 kV  ②≤ 1.2 kV  ③1.0 kV
≤ 1.4 kV  ④≤ 1.6 kV  ⑤≤ 1.8 kV  ⑥
≤ 2.3 kV  ⑦≤ 2.4 kV  ⑧≤ 4.0 kV  ⑨
Voltage protection Up at 5 kA (8/20 μs)≤ 1 kV
Nominal load current a.c IL20 kA
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 UIPE≤ 1 mA
Response time ta≤ 25 ns≤ 100 ns
Max. mains-side over-current protection125 A gL/gG
Short-circuit current rating ISCCR10 kArms
Number of ports1
Type of LV systemTN-C, TN-S, TT (1+1, 2+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 12.5 ka (10/350), 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.

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Packaging & Shipping

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