Sutter Instrument Lambda 421, Operation Manual

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LAMBDA 421 OPERATION MANUAL – REV. 1.00N (20170623)
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APPENDIX B. FUSE REPLACEMENT
In the event that the controller fails to power up when the power switch is turned on, check
the line power fuses to see if either or both have blown. The fuses are located in the fuse
holder on the power entry module on the back of the controller. To remove the fuse holder
first unplug the power cord from the power entry module. Press down on the lever that is
located just above the fuse holder and below the power receptacle, and pry the holder straight
out of the power entry module.
Figure 5-1. Power entry module and fuse location on the rear panel of the Lambda 421 controller.
The fuse holder holds two fuses. Both fuses are of the same type and rating. If either fuse is
blown, it is recommended that both fuses be replaced.
The type and rating of both fuses are as follows:
5 x 20 mm glass tube, Time Delay (IEC 60127-2, Sheet III)
4A, 250V
(Examples: Bussmann GMC-4A)