Standard Ignition RY-621 A/C Compressor Cut-Out Relay

Standard Ignition RY-621 A/C Compressor Cut-Off Relay

The Standard Ignition RY-621 is a 12 V A/C compressor cut-off relay built for Honda and Acura HVAC systems that use a 4-blade, rectangular relay layout. With a 20 amp amperage rating and a female connector with male blade terminals, it matches common OE-style relay specifications for select Acura NSX, Integra, TL, RL, CL, and Honda Civic, Accord, Prelude, CR-V, Odyssey, Element, and Civic del Sol applications.

Key Features

• Part number: RY-621
• 12 V relay for A/C compressor cut-off circuits
• 20 amp amperage rating
• 1 rectangular female connector
• 4 male blade terminals
• Relay only; mounting bracket not included
• Not continuous duty

Detailed Description

Standard Ignition RY-621 is an HVAC relay used in A/C compressor cut-off circuits to control compressor operation in select Honda and Acura vehicles. The relay uses a rectangular connector design with four blade terminals and is specified for 12 V electrical systems. This makes it a direct-match service part for many OE references used across Acura NSX, Integra, TL, RL, and Honda Civic, Accord, Prelude, and CR-V platforms. If you are replacing a failed A/C compressor cut-off relay on a Honda Civic or Acura RSX, RY-621 provides the electrical format and terminal style commonly required by these applications.

This part cross-references FEL-PRO 36001 for the same application.

What It Helps Solve

• A/C compressor that will not engage
• Intermittent compressor cycling caused by relay failure
• No-cool condition related to relay contact wear
• Electrical switching issues in the HVAC control circuit
• Replacement of a damaged or mismatched OE-style relay

Installation Notes and Tips

• Verify connector shape, terminal count, and terminal gender before installation.
• Confirm the vehicle uses a 4-blade relay layout and 12 V system.
• Check the relay socket for heat damage, corrosion, or loose terminals before installing the new relay.
• Match the OE reference or existing relay style on Acura and Honda HVAC relay locations for proper fitment.
• Fits 2003-2007 Honda Element, N/A; 2004-2006 Acura RSX, N/A; 1991-2005 Acura NSX, N/A; 2002-2004 Acura RL, N/A; 2002-2003 Acura RSX, N/A; 2003 Honda CR-V, N/A; 1998-2002 Honda CR-V, N/A; 2001 Acura CL, N/A; 2000-2001 Acura Integra, N/A; 1998 Acura Integra, N/A; 1991-1993 Acura Integra, N/A; 1999-2001 Acura RL, N/A; 1999-2001 Acura TL, N/A; 2001 Honda Civic, N/A; 1998-1999 Honda Civic, N/A; 1997-2001 Honda Prelude, N/A; 1992 Honda Prelude, N/A; 1992-2000 Honda Civic, N/A; 1997-1999 Acura CL, N/A; 1998 Acura NSX, N/A; 1997-1998 Acura RL, N/A; 1995-1998 Acura TL, N/A; 1995-1998 Honda Odyssey, N/A; 1994-1997 Acura Integra, N/A; 1986-1989 Acura Integra, N/A; 1997 Acura NSX, N/A; 1996-1997 Honda Accord, N/A; 1990-1997 Honda Accord, N/A; 1996-1997 Honda Civic, N/A; 1993-1997 Honda Civic del Sol, N/A; 1997 Honda CR-V, N/A; 1996-1997 Honda Odyssey, N/A; 1996-1997 Honda Prelude, N/A; 1988-1989 Honda Prelude, N/A; 1996 Acura NSX, N/A; 1993-1994 Acura NSX, N/A; 1996 Acura RL, N/A; 1993-1996 Honda Prelude, N/A; 1986-1995 Acura Legend, N/A; 1995 Acura NSX, N/A; 1995 Honda Odyssey, N/A; 1991-1994 Acura NSX, N/A; 1990-1993 Acura Integra, N/A; 1986-1991 Honda Civic, N/A; 1988-1991 Honda CRX, N/A; 1990-1991 Honda Prelude, N/A; 1985-1987 Honda Prelude, N/A; 1988-1990 Honda Accord, N/A; 1986-1987 Honda Accord, N/A.

Quality Assurance

Standard Ignition supplies service parts built to match common OE relay specifications for Honda and Acura HVAC applications. The RY-621 is listed with multiple interchange references, including OE-style relay numbers used across Acura and Honda A/C compressor cut-off systems.