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Learn more by watching our NLS 30539 | Surge Arrestor 1 Pole 20ka 275V | SPD1R video.
The NLS 30539 is a single-pole surge protection device rated for 20kA nominal discharge current and 275V AC continuous operating voltage. The 30539 mounts on a standard DIN rail inside the switchboard and uses a replaceable wedge module, so the surge cassette can be swapped out without rewiring after it absorbs a transient. It carries a maximum discharge rating of 40kA and a response time of 25 nanoseconds.
A switchboard without surge protection leaves connected appliances exposed to transients from lightning strikes, grid switching, and nearby electrical faults. Computers, televisions, and fridges on the same board can fail outright, or degrade quietly after repeated low-level surges. The 30539 sits ahead of the protected circuits, giving the board a first line of defence before a transient reaches sensitive equipment. It carries a 20kA nominal discharge rating and a 40kA maximum discharge capacity for larger events.
Electricians fitting the 30539 get a straightforward retrofit. It clips onto existing DIN rail without extra wiring runs, and the replaceable wedge design turns a future surge event into a quick module swap. It is well priced against comparable single-pole arrestors, which keeps it an easy add-on to a switchboard upgrade or a new-build quote. The red housing makes it simple to identify on a crowded board during fault-finding.
The NLS 30539 is not rated for three-phase installations and does not replace a circuit breaker, RCD, or main switch on the board. It must be installed by a licensed electrician and is not a DIY switchboard component.
Verified Sparky Direct customer reviews: NLS 30539 | Surge Arrestor 1 Pole 20ka 275V | SPD1R (30539)
"Great product for the price." — Alan
"Good product at reasonable price" — Tony
"Ideal for first line of defence for sensitive equipment equipment" — Jim
(30539)
Installation of the NLS 30539 must be carried out by a licensed electrician. The manufacturer's documentation specifies professional installation only, and the unit clips onto standard 35mm DIN rail inside the switchboard.
The NLS 30539 is a single-pole device and is not rated for three-phase protection. It protects the active conductor on a single-phase circuit, suited to domestic and light commercial boards.
The 30539 uses a replaceable wedge module, so the surge protection cartridge can be swapped out after absorbing a transient. The base unit stays mounted on the DIN rail during the swap.
The nominal discharge current (In) is 20kA, the rating the device handles repeatedly under typical lightning-induced transients. The maximum discharge current (Imax) is 40kA, the highest single surge the unit can absorb.
No, the 30539 does not replace a circuit breaker, RCD, or main switch. It works alongside existing circuit protection to clamp transient surges before they reach connected circuits.
The NLS 30539 carries a 12-month warranty from the date of purchase, covering manufacturing defects. Warranty claims are returned to Sparky Direct for assessment under the standard return process.
The NLS 30539 is available online from Sparky Direct, with Australia-wide delivery to any state or territory including regional areas. Sparky Direct is an Australian electrical wholesaler established in 2005, supplying more than 500,000 customers with transparent trade pricing.
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Warranty starts from Invoice Date
Domestic Use: 1 Year
Commercial Use: 1 Year
Warranty Method: Return to Sparky Direct
These specifications and characteristics outline physical, mechanical, electrical details.
| Brand | NATIONAL LIGHT SOURCES |
| SKU | 30539 |
| Model # | 30539NLS |
| Barcode # | 9336700011451 |
| Package Weight | 0.134kg |
| TYPE | VALUE |
|---|---|
| Type | Surge protection device |
| Brand | National Light Sources |
| Colour | Red |
| Number of Poles | 1 |
| In (KA) | 20 |
| Imax (KA) | 40 |
| Voltage (V) | 275 VAC |
Electrical and HVAC products sold by Sparky Direct are intended for installation by licensed and appropriately qualified professionals in accordance with applicable Australian Standards and regulatory requirements. Customers are responsible for ensuring that any product purchased, including any related or associated components, is compatible and suitable for their intended installation and application.
Sparky Direct does not provide installation advice and does not assess product suitability for individual circumstances unless expressly confirmed in writing. Customers must confirm correct product selection, compatibility, compliance, and suitability with a licensed or appropriately qualified professional prior to purchase.
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