650V Single Phase LV Arrester
- Model: KT40-277/S
KT40-480/2P Surge Protective Device（SPD）is designed for 480V AC Split Phase systems. It provides reliable protection against transient overvoltages caused by lightning strikes or switching operations, effectively limiting surge voltage to a safe level. Widely used in industrial, commercial, and distributed power systems.
Low loss, High interrupting capabllity
Resetting Mechanlsm&Emergency Control, Easy for Malntalnance
Complete Certification
Specifications
| Model No. | KT40-277/2P |
| Power System Un | 277Vac |
| Max continuous operating voltage (AC) MOCV | 650 Vac |
| Nominal discharge current（8/20us） In | 5KA |
| Max discharge current（8/20us） Imax | 40KA |
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Standards
The KT40-480/2P Low voltage lightning rod 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. It is ideal for long term use in harsh natural exposure environments.
❶ Model and specification
Model No. KT40-480/2P Type Light Duty(outdoor type) Excellent weather resistance In accordance with IEEE Std C62.11,UL1449 4th edition Power System Un 120/480Vac(Split phase Frequency 50/60Hz Max continuous operating voltage (AC)MOCV 550 Vac 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 < 1.8ky 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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