UKT348213E40 Tesla UKT3-40A 4 Pole 40 Amp Enclosed Changeover Switch 1-0-2

Description

Tesla UKT3-40A. 4 Pole 40A Enclosed Changeover Switch. 1-0-2. IP54/IP66. 690V AC.

The Tesla UKT3-40A is a 4 pole 40 amp enclosed changeover switch with a 1-0-2 rotary switching function — factory mounted in a polycarbonate Fibox enclosure for surface or wall mounting. The rotary operator on the front of the enclosure provides Source 1 / Off / Source 2 switching, allowing the connected load to be transferred between two independent supply sources with a clearly defined off position between them. IP54 rated enclosure body, IP66 rated front operator. Sold individually.

• Tesla UKT3 Series — Enclosed Changeover Switch
• 4 pole — switches all 4 conductors simultaneously
• 40A rated current (Ith thermal current, open)
• Switching function: 1-0-2 — Source 1 / Off / Source 2
• Front operated rotary switch — clearly engraved 1 0 2 positions
• Enclosed — factory mounted in polycarbonate Fibox enclosure
• IP54 enclosure body / IP66 front operator
• Nominal operational voltage (Un): 690V AC
• Rated insulation voltage (Ui): 690V
• Impulse withstand voltage (Uimp): 6kV
• Rated frequency: 50/60Hz
• Dimensions: 176mm H x 116mm W x 101mm D
• Compliant with VDE, DIN, IEC, UL, and CSA standards
• Sold individually

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What the Tesla UKT3-40A Enclosed Changeover Switch Does

A changeover switch transfers a connected electrical load between two separate supply sources — in the 1-0-2 configuration, position 1 connects the load to Source 1, position 0 is off (both sources disconnected), and position 2 connects the load to Source 2. The defined off position between the two live positions is critical for safe source switching — it prevents both supply sources from being connected simultaneously and provides a clear isolation point during the changeover operation.

Common applications for a 40A 4-pole enclosed changeover switch include generator changeover installations where a building or facility needs to be transferred between grid power and a standby generator supply, dual-supply switchboard arrangements where two separate feeders serve the same load, and solar or renewable energy installations where the supply source needs to be selected or alternated. The 4-pole configuration switches all four conductors simultaneously — active, neutral, and earth paths — ensuring full isolation of the outgoing source during the changeover.

The enclosed format means the UKT3 cam switch mechanism is factory-mounted inside a polycarbonate Fibox enclosure — ready to install directly on a wall or surface without requiring separate panel mounting or enclosure procurement. The IP54 enclosure body provides protection against dust and water splashing from all directions, with the front rotary operator upgraded to IP66 — suitable for outdoor installations and locations where the front face is exposed to water jets or wash-down conditions.

The Tesla UKT3 enclosed changeover switch range covers 20A (E20), 40A (E40), 63A (E63), and 100A (E100) in the 4-pole 1-0-2 configuration. Panel-mount (non-enclosed) versions are also available in the UKT3 panel range for installations where the switch is to be mounted in an existing switchboard or enclosure.

Q: What does the 1-0-2 switching sequence mean?
A: Position 1 connects the load to Supply Source 1. Position 0 is the off position — both supply sources are disconnected from the load. Position 2 connects the load to Supply Source 2. The rotary operator must pass through the 0 (off) position when switching between sources, preventing both supplies from being connected at the same time.

Q: Why is a 4-pole changeover switch used instead of a 3-pole?
A: A 4-pole changeover switch simultaneously switches all four conductors — the three active phases and the neutral. This is important in generator changeover applications where the neutral from the generator must be isolated from the grid neutral when the generator is supplying the load. Switching only the active phases (3-pole) and leaving the neutral permanently connected can create issues in some generator configurations. For single-phase applications, a 4-pole switch can still be used by connecting to the relevant poles.

Q: What is the IP rating of the enclosure?
A: The enclosure body is rated IP54 — protected against dust ingress and water splashing from all directions. The front operator (rotary switch) is rated IP66 — dust-tight and protected against powerful water jets. This makes the unit suitable for outdoor and wash-down environments.

Warranty

This product is backed by an extended manufacturer warranty - click here for details.