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Operating Instructions

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Troubleshooting
Siemens Building Technologies, Inc. 55
Fuses
Verify that 120 Vac power is available on the secondary side of the power transformer. If
power is not proper, check the Bypass components, such as:
• Power transformer
• Power transformer fuses (F1, F2, and F3). Table 8 provides fuse replacement
information.
Table 10. Fuse Replacement Information.
NEMA Type 3R Bypass Enclosure ABC
250 VA Transformers
Voltage Primary Fuse (F1 and F2) Secondary Fuse (F3)
208V Bussmann/Littlefuse LP-CC-3.5 Bussmann/Littlefuse LP-CC-3.5
240V Bussmann/Littlefuse LP-CC-3.2 Bussmann/Littlefuse LP-CC-3.5
480V Bussmann/Littlefuse LP-CC-1.6 Bussmann/Littlefuse LP-CC-3.5
575V Bussmann/Littlefuse LP-CC-1.25 Bussmann/Littlefuse LP-CC-3.5
NEMA Type 3R Bypass Enclosure DE and F
750 VA Transformers
Voltage Primary Fuse (F1 and F2) Secondary Fuse (F3)
208V Bussmann/Littlefuse LP-CC-9 Bussmann/Littlefuse LP-CC-10
240V Bussmann/Littlefuse LP-CC-8 Bussmann/Littlefuse LP-CC-10
480V Bussmann/Littlefuse LP-CC-4.5 Bussmann/Littlefuse LP-CC-10
575V Bussmann/Littlefuse LP-CC-3.5 Bussmann/Littlefuse LP-CC-10