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What are the differences between the VAMP 221/321 modules?

What are the differences between the VAMP 221/321 modules:
VAM 3L
- Three supervised fiber loop arc sensor connections
- One heavy duty trip relay
- Portable arc sensor connection

VAM 4C
- 3-phase current measurement or 2-phase and earth-fault current measurement
- Current pick-up setting by potentiometer and led display
- Indication of current channel pick-up
- One heavy duty trip relay

VAM 10L
- 10 point arc sensor connections
- Portable arc sensor connection
- One heavy duty trip relay
- Continuous supervision of APS_SENSORS
- Indication of the sensor channel and trip relay activation

VAM 12L
- 3 selective trip output contacts for dedicated APS_SENSORS
- 10 point arc sensor connections
- Portable arc sensor connection
- One heavy duty trip relay
- Continuous supervision of APS_SENSORS
- Indication of the sensor channel and trip relay activation

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