Comparison : Item # PLS-5.5-V-840-HYB, PLS Hybrid A+B 2-Pin
Item # PLC-9-H-840-BYP, PL Bypass 2-Pin
Item # PLC-8.5-V-8FA-HYB, PL Hybrid A+B 2-Pin Field Adjustable
Item # PLT-16-H-850-DIR, PL Direct 4-Pin
Item # PLC-9-H-850-BYP, PL Bypass 2-Pin