- Interfaces
Below is a chart showing the range of interfaces available from Apollo.
| Standard Enclosure | DIN-Rail Enclosure | Miniature Enclosure | |
| Mini Switch Monitor |  |
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| Mini Switch Monitor (Interrupt) | |
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| Switch Monitor | |
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| Switch Monitor Plus | |
|
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| Zone Monitor | |
|
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| Sounder Control Unit | |
|
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| Input/Output Unit | |
|
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| Output Unit | |
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| Dual Isolator | |
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| 3 Channel Input/Output Unit | |