Issue
User needs to know which I/O units are compatible with VAMP 221

Product Line
VAMP 221

Environment
I/O units

Resolution
The following I/O units are compatible with VAMP 221. Details for each unit are provided below.

• VAM 12L accommodates up 10 arc APS_SENSORS, 3 APS_SENSORS have dedicated trip outputs
• VAM 12LD accommodates up 10 arc APS_SENSORS, 3 APS_SENSORS have dedicated trip outputs
• VAM 10L accommodates up 10 arc APS_SENSORS
• VAM 10LD accommodates up 10 arc APS_SENSORS
• VAM 3L accommodates up to 3 fiber loops
• VAM 3LX accommodates up to 3 fiber loops with sensitivity adjustment
• VAM 4C accommodates up to 3 current transformers
• VAM 4CD accommodates up to 3 current transformers