How to Replace the Fuses
Chapter Five: Maintenance and Troubleshooting
46
How to Replace the Fuses
The only maintenance required on the Type 270 instrument is changing the fuses. To replace the
fuses:
1. Select the proper fuses.
All units have two fuses installed to fuse both sides of the line. The fuse values, marked
on the rear panel, are:
•
100/120 VAC = 0.6 Amperes Slow Blow Type
•
220/240 VAC = 0.3 Amperes Slow Blow Type
Refer to Table 13 for a description of the fuses. To change the line voltage selection,
refer to the How to Change the Line Voltage Selection section on page 40.
Fuses for the Type 270 Instrument
Nominal Line
Line Voltage Range
Fuse Type
100 VAC
90 - 110 VAC @50/60 Hz
75 VA (max)
0.63A (T), 250 V,
5x20 mm
120 VAC
108 - 132 VAC @50/60 Hz
75 VA (max)
0.63A (T), 250 V,
5x20 mm
220 VAC
198 - 242 VAC @50/60 Hz
75 VA (max)
0.315A (T), 250 V,
5x20 mm
240 VAC
216 - 264 VAC @50/60 Hz
75 VA (max)
0.315A (T), 250 V,
5x20 mm
Table 13: Fuses for the Type 270 Instrument
Note
1.
The fuses are IEC rated (where the name plate value is the expected
current carrying rating) and not UL or CSA rated (where the name
plate value is nearly the current blowing rating). Use of UL or CSA
rated fuses will cause unnecessary blowing at high loads.
2.
Appropriate replacement fuses include:
•
Bussmann GDC-T315 mA or equivalent for the 0.315 A fuse
•
Bussmann GDC-T630 mA or equivalent for the 0.63 A fuse
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