Schneider Electric XB4BG03 Key Selector Switch 3-Pos 2 NO

XB4BG03: three-position key selector switch, key 455

The XB4BG03 is a Schneider Electric Harmony XB4 metal key selector switch for a 22 mm hole. It has three positions spaced at ± 45 degrees, stay-put action, two normally open contacts and a black key operator that uses key 455. Seven Star LLC supplies the XB4BG03 in Oman and the GCC as an independent supplier based in Muscat.

A key switch controls who may change a mode, not only what the mode is. Typical roles are hand-off-auto selection restricted to trained staff, a local/remote lock on a control station, a maintenance bypass or a commissioning mode that must not be left active by accident. The datasheet states that the key can be withdrawn in any position, so the setting can be locked wherever it is left.

Key 455, withdrawal and access control with XB4BG03

The datasheet lists the keylock as key 455 and withdrawal in any position. Withdrawal in any position is a deliberate choice: it lets the operator leave the switch in hand, off or auto and take the key away, so the selection cannot be altered by anyone else. The same key number across several switches means one key opens all of them, which is convenient for a single supervisor but means a lost key opens every XB4BG03 on the site that shares the code, so key custody should be written into the plant procedure.

The keyhole cover ZBGP is referred to in the datasheet for the IK06 impact rating; it is an accessory that protects the keyhole when the key is withdrawn and is worth specifying on outdoor or washdown panels. Spare keys are a separate matter and should be confirmed with the supplier before the first handover, not after one has been lost.

Typical uses of XB4BG03 in Oman and the GCC

Key selectors protect mode changes on pump stations, compressor and generator panels, crane and lift controls, access gates and process skids across Oman and the GCC. They are also used on fire and gas panels, where a keyed inhibit stops a detector being left out of service unnoticed. Metal construction, a wide temperature window and sealing up to the listed IP level suit hot, dusty or humid sites.

Panel mounting and terminal wiring of the XB4BG03

The operator fits a standard 22.5 mm hole. The body measures 47 mm high, 30 mm wide and 86 mm deep, and weighs 0.127 kg, so the rear depth is the figure to check on shallow doors, and remember that a key switch is deeper than a push-button because of the lock barrel. The datasheet gives a tightening torque of 0.8 to 1.2 N.m for the terminals and lists screw heads compatible with Philips and pozidriv No 1 drivers as well as flat 4 mm and 5.5 mm blades.

Conductor capacity is up to two 1.5 mm² wires with cable ends, or single wires from 0.22 mm² upward without ends. The datasheet also states a resistance to a high-pressure washer of 7000000 Pa at 55 °C from 0.1 m, which is useful for food, beverage and marine-type duty, though a clean, undamaged seal against the panel is what makes the rating real in practice.

Selection checklist and RFQ information for XB4BG03

Send the points below so that the part number can be confirmed against the datasheet and checked for availability in a single reply.

• Required quantity and the full part number XB4BG03.
• Panel thickness and the position of any anti-rotation key or nameplate.
• Rear clearance behind the panel, checked against the body depth.
• Control voltage and current of the circuit the contacts will switch.
• Any approval needed by the project, such as marine or UL, compared with the datasheet.
• Delivery location in Oman or the GCC and the lead time you need.
• Key code required (here key 455) and how many keys per switch are needed.

Sealing, temperature and approvals of the XB4BG03

The chromium-plated metal bezel and zamak fixing collar give this operator a robust front face. The datasheet lists protection ratings of IP66, IP69, IP69K, IP67, and the unit is stated for UL type 4X/13 enclosures, so it can sit in washdown or dusty locations where a plain panel hole would not survive. Operating and storage temperatures are both given as -40 to 70 °C, a wide window that covers a summer-heated switch room as well as an unheated outdoor cabinet.

The approvals listed on the datasheet are BV, UL, CSA, DNV, LROS (Lloyds register of shipping). Marine and offshore projects often ask for the Lloyd’s Register, Bureau Veritas or DNV entries, but XB4BG03 should only be accepted against a requirement that appears on the datasheet for this exact reference. Vibration resistance is 5 gn between 2 and 500 Hz, with shock rated at 30 gn for 18 ms and 50 gn for 11 ms, figures worth quoting when the panel is mounted on a skid or on rotating plant.

Contact logic of the XB4BG03

With three positions and two normally open contacts, the usual mapping gives each outer position its own contact and leaves the centre open, so the selector can drive two separate enabling circuits, for example local and remote. The datasheet lists terminal marking (23-24)NO, (13-14)NO and a handle torque of 0.14 N.m at contact change. Positive opening is listed as not provided, so keep any stop function on a dedicated stop button.

Confirm the position-to-contact mapping against your schematic before wiring. The drawings in the datasheet show the terminal layout, but the mapping of the left and right positions depends on how the contact blocks are assembled and should be proved during testing.

Technical specifications of the XB4BG03

Contact ratings and life of the XB4BG03

The contact blocks are silver alloy (Ag/Ni). The thermal current is 10 A, the insulation voltage is 600 V at pollution degree 3 and the impulse withstand is 6 kV. Operational ratings include 3 A at 240 V and 6 A at 120 V in AC-15, and 0.27 A at 250 V and 0.55 A at 125 V in DC-13, with a 10 A gG cartridge fuse specified for short-circuit protection. These are control-circuit ratings: the contacts switch relay coils, PLC inputs and contactor coils rather than motors directly.

Electrical life is stated as 1 million cycles at 2 A, 230 V in AC-15, 3 A at 120 V and 4 A at 24 V, at up to 3600 operations an hour with a load factor of 0.5, and 1 million cycles in DC-13 at 0.2 A, 110 V and 0.5 A, 24 V. Mechanical life is 1 million operations.

Documents and quotation

The Schneider Electric datasheet for the XB4BG03 is attached on this page for your technical file. It carries the electrical, mechanical and environmental data summarised above, together with dimension and wiring drawings.

To request a quotation, send the part number and quantity through the enquiry form and we will reply with availability and delivery terms. Seven Star LLC is an independent supplier and does not act for the manufacturer, so please check the datasheet against your project requirements before ordering.