5. Electronics
Figure 5-3. Power Distribution Components
Input power distribution is accomplished by the following major
components:
• Power Line Circuit Breaker/Mains Switch. This switch is
used to hard power On and Off the Instrument, as well as a
resettable automatic thermal circuit breaker. All input current
passes through this power line circuit breaker. In the event of
excessive current draw by the Instrument, the circuit breaker
will trip thus protecting the Arena. Both sides of the power
line are broken by the circuit breaker.
The power line circuit breaker/mains switch supplies non-
isolated power directly to two loads: the dialysate heater and
the power transformer.
The non-isolated power to the dialysate heater circuit is
switched by means of a solid state relay.
• Radio Frequency Interference Filter. This filter reduces
electrical noise in the power line.
• Terminal Blocks. They are located in the base of the
Instrument. They interconnect the wires from the Mains
Switch to the Isolation Transformer and Heater. There is a
block that contains the Terminal Block Fuse F1.
157-1278-912 Rev A 5-7
November 2003
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