Descrizione
Power does not announce its failure. It simply stops, mid-shift, mid-process, mid-freeze. The Sentinel exists for that exact second. It watches the incoming supply without rest, and when the mains falters it moves the load onto your standby generator before the equipment downstream has time to register the loss. No lever to throw, no flashlight, no scramble across a dark workshop.
The architecture is deliberate. A four-pole frame rated at 250A or 300A switches both phases and the neutral in one mechanical action, which preserves the earthing path and eliminates the stray currents that three-pole arrangements quietly introduce into sensitive loads. The SKT1 control board handles the sensing and the delay logic, so the transfer happens in a controlled sequence rather than a panic. Contacts are sized for repeated make-and-break cycles under inductive load, the electrical equivalent of a handshake that does not weaken with use.
What you receive is a service engineer's component, not a showroom prop. Terminals sit where a screwdriver can actually reach them, the current rating is legible from the front, and the mechanism can be inspected without dismantling the whole panel. For workshops, telecom cabinets, cold-chain rooms, water pumping stations and rural homes running a standby set, the Sentinel converts a fragile single supply into a two-source architecture that keeps working after the first source has given up.
Backup power is not a generator. It is the decision to keep going.
Key Features
- ✦ Automatic dual-source transfer between mains and generator, with no operator intervention required
- ✦ 4-pole switching (three phases plus neutral) in a single action, keeping the neutral reference and earthing path intact
- ✦ Two frame ratings in one family: 250A (SKT1-250/4P) and 300A (SKT1-300/4P)
- ✦ Rated for AC220V supplies with dedicated single-phase and three-phase control-board configurations
- ✦ Mechanical and electrical interlocking that makes paralleling two live sources physically impossible
- ✦ Front-accessible terminals and an open, legible mechanism for fast field inspection and service
- ✦ OEM and ODM customization available for panel builders, generator integrators and private-label programmes
Technical Specifications
- Brand: AISIKAI ATS / SHALUO
- Model Number: SKT1-250/4P, SKT1-300/4P
- Poles: 4P (three phases and neutral)
- Rated Current: 250A and 300A frame options
- Rated Voltage: AC220V
- Function: Dual power automatic transfer between mains and standby supply
- Control Configuration: Single-phase and three-phase control board variants
- Interlock: Mechanical and electrical, prevents simultaneous source connection
- Customization: OEM and ODM supported (is_customized: Yes)
- Origin: Mainland China
Where It Belongs
The Sentinel is specified wherever a second source of power has to be trusted rather than remembered. Panel builders install it as the changeover backbone of small industrial control rooms, food and pharmaceutical cold stores where a two-hour outage means a written-off inventory, telecom and broadcast cabinets that must survive a grid fault without a site visit, water and irrigation pumping stations on rural feeders, and diesel generator sets between 20 and 200 kVA in workshops, farms and off-grid homes. It also suits commercial buildings that keep a standby set for lifts, fire pumps and server rooms, where the switch between sources must be invisible to everyone inside the building.
Frequently Asked Questions
Q: What exactly does an automatic transfer switch do?
It continuously monitors the primary supply. When that supply fails or drifts outside an acceptable range, the switch disconnects the load from it and connects the load to the standby source, then reverses the sequence when the primary supply returns and stabilises. Nothing about the process requires a person to be present.
Q: Should I choose the 250A or the 300A frame?
Choose on the basis of the continuous current your load draws, with margin. The 250A frame (SKT1-250/4P) suits the majority of 20 to 100 kVA standby installations, while the 300A frame (SKT1-300/4P) gives additional headroom for larger sets and for loads with heavy motor inrush, such as pumps, compressors and refrigeration.
Q: Why is a 4-pole switch preferred over a 3-pole switch?
A four-pole device switches the neutral along with the phases. In installations with separate neutral and earth arrangements, that keeps the neutral reference clean, prevents nuisance tripping on residual-current devices downstream, and removes a path for circulating currents. It is the safer choice for modern distribution boards.
Q: Can it be used with a diesel generator?
Yes. This is precisely the application the SKT1 series was designed for. The switch is commonly installed between the mains supply, a diesel generating set and the distribution board, and it is also used with the control board of the generator itself.
Q: Does it work on a three-phase supply?
Both three-phase and single-phase control-board configurations are available, and the 4-pole frame covers the three phases plus neutral. Confirm your supply arrangement when ordering so that the correct variant is supplied.
Q: Can it be customized for our own panel or brand?
Yes. OEM and ODM support is available, including labelling and configuration changes for panel builders and generator integrators who need the switch to fit an existing enclosure or carry their own brand.
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