240V Single Phase LV Arrester
- Model: KT40-240/2P
KT40-240/2P low voltage surge arrester designed for the transformer low-voltage side protection at distribution transformer secondary bushings, against the risk of the harmful effects of transient surges, to ensure the smooth operation of transformer.
Low loss, High interrupting capabllity
Resetting Mechanlsm&Emergency Control, Easy for Malntalnance
Complete Certification
Specifications
| Model No. | KT40-240/2P |
| Power System Un | 120/240Vac（Split phase） |
| Max continuous operating voltage (AC) MOCV | 420 Vac（460 Vac as option ) |
| Nominal discharge current（8/20us） In | 5KA |
| Max discharge current（8/20us） Imax | 40KA |
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Standards
KT40-240/2P LV surge arrester adopts UL certified high-perfomance MOV as the core components, with high surge discharge capacity and low voltage protectionlevel. lt can effectively suppress the transient over voltage on power line caused by lightning strikes and other electrical source.
KT40-240/2P is designed for the transformer low-voltage side protection at distribution transformer secondary bushings, against the risk of the harmful effects of transient surges, to ensure the smooth operation of transformer.
The KT40-240/2P use high grade 304# stainless steel (with Chromium plating) as frame holder, and use PC/ABS Alloy materials as enclosure housing with a tight waterproof and flame resistant package. lt is ideal for long term use in harsh natural exposure environments.
- Comply with UL1449 4th, IEEE Std C62.11™;
- Wide voltage range single-phase power protection; The KT40/240-2P is suitable for 120/240V single phase networks with large voltage fluctuation;
- Max discharge current 40kA(8/20 us);
❶ Model and specification
Model No. KT40-240/2P Type Light Duty(outdoor type) Excellent weather resistance In accordance with IEEE Std C62.11,UL1449 4th edition Power System Un 120/240Vac(Split phase Frequency 50/60Hz Max continuous operating voltage (AC)MOCV 420 Vac(460 Vac as option) Nominal discharge current(8/20us) in 5kA Max discharge current(8/20us) lmax 40kA Voltage impulse (1.2/50us) BlL Uoc 10kV Maximum Discharge Voltage (KV crest)8/20 μs Current Wave @3kA <1.6kV Max @5kA < 1.7ky Max @20kA < 2.2kV Max @40kA < 2.6kV Max Leakage current IL <0.1mA Power Frequency Test 50/60HZ Dry : ≥10 KV rms (1 minute)
Wet : ≥6KV rms ( 10 sec)Operating temperature range - 40°C~+85°C Wire Connection L: Black wire; N/G: white wire
Each wire with 1pc Lug(5.5-12) or (5.5-16)Wire specification UL1015 10AWG: 390mm (length to terminal hole) support frame 304# stainless steel (with Chromium plating) Dimension (HxWxD) 131.4x45.5x27.5mm Enclosure housing material (Polycarbonate) PC/ABS Alloy
- 40°C~+ 100°C(Flame retardant rating: UL94/V-0)Insulation Material Epoxyresin 25KV/mm
-40°C~+ 160°CDegree of protection IP68 (or NEMA6P)
❷ Dimensional Drawing
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Photos
Application
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FAQS
Q1:How to determine the nominal discharge current of a single-phase low-voltage surge arrester?
A1:It is determined based on the possible overvoltage conditions and protection requirements of the system. Generally, for a 480V system, products with a nominal discharge current (In) of 5kA – 20kA can be selected. If the system is located in an area with frequent lightning activities, a larger value should be chosen.
Q2:What is the response time of a single-phase low-voltage surge arrester?
A2:Modern zinc oxide surge arresters typically have a response time in the nanosecond range, which can respond to overvoltage in an extremely short time and conduct current quickly. Generally, it can be between a few nanoseconds and dozens of nanoseconds.
Q3:If the surge arrester has not reached its service life but has experienced multiple lightning strikes, does it need to be replaced?
A3:It needs to be judged according to specific conditions. If the surge arrester is equipped with a surge counter, you can check whether the count exceeds the rated limit specified by the manufacturer. If the count is close to or exceeds the limit, or if performance degradation (such as excessive leakage current) is found through testing, the surge arrester should be considered for replacement even if it has not reached its service life.
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