Description
Mars / MEI TRC-6512 MDB Coin Changer
Three-tube MDB coin changer for vending machines and other MDB equipment. Accepts U.S. nickels, dimes, and quarters, with switch-selectable acceptance of $1 coins, and pays out change from three dedicated tubes.
Key features
- 3-tube payout: nickel, dime, and quarter
- Multi-Drop Bus (MDB) interface with standard 6-pin MDB harness
- Power: 24/34 VDC (nominal 24 VAC rectified and filtered), supplied by the machine controller
- Option switches for low/high quarter inventory, $1 coin accept/reject, and maximum acceptance vs. security
- Diagnostic LED for status and error codes
- Modular design for easier service
Approximate coin capacity
- Quarters: 69–74
- Dimes: 98–99
- Nickels: 66–67
- Change capacity roughly $35–$40 depending on fill level
Compatibility notes
- Direct upgrade/replacement for the MEI TRC-6510
- Commonly used as a replacement for the Coinco 9302-GX
- Fits MDB soda, snack, and combo machines that use a standard 3-tube MDB coin mech
Confirm your machine uses MDB (not an older single-price or 12-pin interface) and that the mounting and harness match before ordering.

