| 3500/33-01-00 | 149986-01 | 149992-01 | Standard 16-channel relay output | No agency approval option |
| 3500/33-01-01 | 149986-01 | 149992-01 | Standard 16-channel relay output | cNRTLus / CSA/NRTL/C |
| 3500/33-01-02 | 149986-01 | 149992-01 | Standard 16-channel relay output | ATEX / IECEx / CSA (Class I, Zone 2) |
| 3500/33-02-00 | 149986-01 | 149992-02 | Failsafe 16-channel relay output | No agency approval option |
| 3500/33-02-01 | 149986-01 | 149992-02 | Failsafe 16-channel relay output | cNRTLus / CSA/NRTL/C |
| 3500/33-02-02 | 149986-01 | 149992-02 | Failsafe 16-channel relay output | ATEX / IECEx / CSA (Class I, Zone 2) |
| 3500/33-03-00 | 149986-01 | 149992-03 | Low-current 16-channel relay output | No agency approval option |
| 3500/33-03-01 | 149986-01 | 149992-03 | Low-current 16-channel relay output | cNRTLus / CSA/NRTL/C |
| 3500/33-03-02 | 149986-01 | 149992-03 | Low-current 16-channel relay output | ATEX / IECEx / CSA (Class I, Zone 2) |
| 3500/33-04-00 | 149986-01 | 149992-04 | Low-current failsafe 16-channel relay output | No agency approval option |
| 3500/33-04-01 | 149986-01 | 149992-04 | Low-current failsafe 16-channel relay output | cNRTLus / CSA/NRTL/C |
| 3500/33-04-02 | 149986-01 | 149992-04 | Low-current failsafe 16-channel relay output | ATEX / IECEx / CSA (Class I, Zone 2) |