Overview
Manuals
YO Opening Release
YC Closing Release
Breaker Control Test
Features:
- ABB identifies 1SDA073674R1 as the YO shunt opening release and 1SDA073687R1 as the YC shunt closing release. Both are 220–240 V AC/DC accessories for E1.2 through E6.2 and compatible XT7/XT7M frames.
- Treat the two article numbers as different coil functions: YO opens the breaker and YC closes it. Confirm the breaker frame, coil position, 220–240 V AC/DC control supply and wiring diagram before replacement.
- Prove the remote trip and close commands independently, including the breaker interlocks and control-supply supervision.
1SDA073674R1/1SDA073687R1 must be selected from the complete manufacturer identity and the receiving-system evidence. Use the pair only where the documented breaker control scheme requires both remote opening and remote closing. Isolate the main and auxiliary circuits, identify the YO and YC conductors separately and verify the accessory slots before fitting.
Official source: ABB Emax 2 accessory catalogue and ABB product records for 1SDA073674R1 and 1SDA073687R1. Article meanings, 220–240 V AC/DC rating and supported breaker families.
1SDA073674R1/1SDA073687R1 official technical documentation and related ABB resources.
Important Notice: Confirm the complete article number and installed configuration before replacement. Each link opens in a new page.
1SDA073674R1 is the YO shunt opening release; its wiring and accessory position must match the breaker diagram.
1SDA073687R1 is the YC shunt closing release; closing is permitted only by the breaker interlock chain.
After installation, test remote trip, remote close, anti-pumping and the applicable permissive contacts.
