Schneider Electric XB5AG21 2-Position Key Selector Switch

XB5AG21: two-position maintained key selector switch, key 455, 1 NO

The XB5AG21 is a Schneider Electric Harmony XB5 key-operated selector switch for a 22 mm hole. It has two positions, a stay put action, a Key 455 lock, key withdrawal left-hand and one normally open (NO) contact. Seven Star LLC supplies the XB5AG21 in Oman and the GCC as an independent supplier based in Muscat, normally to panel builders and plant maintenance teams that must restrict who can change a mode, release a bypass or authorise a manual operation.

The datasheet describes the product in words rather than through an ordering table, so our reading of the code is an interpretation and not a manufacturer table: XB5 names the range, AG identifies the key switch family, and the digits describe positions, action and contacts. Look at the family table below to see how its four siblings XB5AG21, XB5AG33, XB5AG41 and XB5AG61 are separated.

Selection checklist and RFQ information for XB5AG21

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

• Part number XB5AG21 and the required quantity.
• Positions, action and contacts: two positions, stay put, 1 NO.
• The key withdrawal position the safety procedure requires.
• Whether a shared Key 455 is acceptable, or the site needs a different key arrangement.
• Rear clearance behind the panel for the 96 mm body.
• Delivery location in Oman or the GCC and the lead time you need.

Key 455 and access control on the XB5AG21

The key can be withdrawn only in the left-hand position. That makes the left setting the locked, secured state: whoever holds the key decides when the switch rests there, and nobody else can leave it in that position after taking the key away.

The lock is listed in the datasheet as Key 455. Every switch with that number accepts the same key, which is convenient for a shift supervisor who carries one key for many panels, and a weakness when the key must be unique to one machine. If access control matters on your site, say so in the enquiry so that the key arrangement can be checked against the manufacturer’s documents. The body is 96 mm deep behind the panel, noticeably deeper than the 70 mm of a plain selector, because the lock cylinder sits behind the head.

Contact ratings and switching data of the XB5AG21

This unit carries one normally open (NO) contact, terminals marked (13-14)NO under ISO numbering. One NO contact switches a single circuit or a single controller input. Decide early whether the process needs a second contact for a hard-wired interlock, because the contact count cannot be added to this reference.

The datasheet lists a conventional thermal current of 10 A, a rated insulation voltage of 600 V at pollution degree 3 and an impulse withstand of 6 kV, with short-circuit protection by a 10 A gG cartridge fuse. Operational currents are given by utilisation category:

• 3 A at 240 V, AC-15, A600
• 6 A at 120 V, AC-15, A600
• 0.1 A at 600 V, DC-13, Q600
• 0.27 A at 250 V, DC-13, Q600
• 0.55 A at 125 V, DC-13, Q600

The silver alloy (Ag/Ni) contacts have a rated electrical life of 1 million cycles at 2 A, 230 V, AC-15, and the mechanical life stated for the actuator is 1,000,000 cycles. Reliability at low signal levels is quoted at 5 V and 1 mA in a clean environment, which is useful when the contact feeds a PLC input rather than a coil.

Typical uses of XB5AG21 in Oman and the GCC

Key switches are used wherever a human decision must be recorded and protected: bypass of a safety interlock under supervision, local-remote transfer on a pump house, manual release on a crusher or conveyor, and test modes on switchgear. In oil and gas, power generation and desalination plants the sealed head and metal lock resist dust and humidity, while the key itself gives a simple record of who holds authority. Many sites hold the key switch as a spare for exactly the panels that must keep a permit control.

How the XB5AG21 operates

This is a maintained two-position key switch. The key is turned through 90° and the switch holds that state, so this unit acts as a protected mode or permit selector: maintenance versus normal, bypass on versus off, or local control released. Because the state does not return by itself, the position of the key cylinder shows the setting at a glance.

XB5AG21 among the Harmony XB5 key-switch family

The five key-switch references here share the Key 455 lock and a 96 mm body depth and differ in positions, action, contacts and key withdrawal. Siblings of this unit: XB5AG33, XB5AG33N, XB5AG41, XB5AG61.

Sealing, temperature and approvals of the XB5AG21

The datasheet lists IP66, IP67, IP69, IP69K protection, with operation from -40 to 70 °C and storage from -40 to 70 °C. Shock resistance is given as 30 gn for 18 ms and 50 gn for 11 ms, and vibration as 5 gn over 2 to 500 Hz. Certifications listed for this reference: Lloyd’s Register (LROS), CSA, DNV, BV, UL.

This unit needs a 22.5 mm round hole and a panel thickness of 1 to 6 mm as per the datasheet drawing. The head is 30 mm wide and 42 mm high, and the body is 96 mm deep, so verify clearance behind the door when the enclosure has a rail or a gland plate close to the back. The datasheet recommends an anti-rotation plate, type ZB5AZ902, for selector switches so the key torque cannot twist the body in the hole.

Terminals are screw clamps, up to two 1.5 mm² conductors with cable ends or at least 0.22 mm² without ends, with a tightening torque of 0.8 to 1.2 N.m. Keep the key in hand during commissioning so the position under test is the one you expect before you close the door.

Technical specifications of the XB5AG21

Documents and quotation

The Schneider Electric datasheet for the XB5AG21 is attached on this page for your technical file. It carries the electrical, mechanical and environmental data summarised above, together with the dimension drawing and the panel cut-out details.

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.