ntsqd
technerd
It is my understanding that within Anderson brand connectors that each of the different colors are keyed differently. Any two of like color will mate, but any mix of colors will not mate. From their FAQ:Also some of the SB 175s are keyed, recommend that you check that there's not something going on with that. If they mixed up a keyed and non-keyed connector when your order shipped that might be the issue.
- Why are the SB/SBS/SBE/SBX Connectors color coded and keyed?
Anderson power has developed different mechanical keys that coincide with the National Electric code voltage level to prevent incompatible voltages from being cross mated. Note however the mechanical keying and color does not restrict the voltage capability of the connector. Most of Anderson Power Connectors are rated to 600 volts per UL 1977 (see datasheet for specific ratings).