ABB OA1G01 Early Opening Auxiliary Contact 1NC for A/AF Contactors

In industrial control panels, electricians often need a reliable signal that a contactor has opened, especially for safety circuits. The ABB OA1G01 auxiliary contact provides an early opening normally closed (NC) contact, ensuring the feedback signal is sent before the main contacts separate. This front-mounted block snaps directly onto ABB A-line and AF-line contactors, simplifying installation and enhancing circuit monitoring.

Key specifications

• Contact configuration: 1 NC early opening
• Rated operational current: 6 A at 230 V AC (AC-15), 3 A at 400 V AC, 2.5 A at 24 V DC (DC-13), 0.27 A at 220 V DC
• Rated operational voltage: 690 V AC / 250 V DC
• Rated insulation voltage: 690 V
• Rated impulse withstand voltage: 6 kV
• Terminal type: screw terminals
• Mounting: front mounted on contactor
• Degree of protection: IP20 (terminals)
• Standards: IEC 60947-5-1, EN 60947-5-1, UL 508, CSA 22.2 No. 14
• Minimum switching capacity: 17 V / 5 mA
• Connection capacity: flexible 1x 0.75-2.5 mm², rigid 1x 1-4 mm²
• Ambient temperature: operation -25 to +70 °C, storage -40 to +70 °C
• Mechanical durability: 10 million cycles
• Electrical durability: 1.5 million cycles (AC-15)

Why choose it

The early opening feature ensures that the NC contact opens before the main contacts, which is critical for safety interlocks and status feedback. Its robust design meets international standards, and the screw terminals provide secure wiring. With high electrical and mechanical durability, it offers long-term reliability in demanding industrial environments.

Ideal use cases

• Safety interlock circuits requiring early contact opening
• Status feedback for contactor position in control panels
• Automation systems using ABB A-line or AF-line contactors
• Machinery where reliable signal before main contact separation is essential

Good to know

The OA1G01 is compatible with a wide range of ABB contactors from A9 to A110 and AF09 to AF96. Its compact front-mount design saves space and simplifies wiring. The screw terminals accept both flexible and rigid conductors, ensuring a secure connection in vibration-prone installations.