bonitron M3534-I3, Customer Reference Manual

Page: 39 / 56

User’s Manual
39
6.3. E
FFICIENCY
/ P
OWER
C
ONSUMPTION
All M3534 models are 93% efficient or better at full load. Power consumption in
standby mode is less than 25W for 20A models and less than 40W for the 40A and
85A models.
6.4. B
RANCH
C
IRCUIT
P
ROTECTION AND
W
IRE
S
IZING
The following information is supplied for assistance in selecting the appropriate field
wiring sizes and power source fuse ratings for the M3534:

Wire size must be coordinated with circuit protection devices and IR drop of wire.
It is NOT necessary to size wire for continuous duty. Maximum allowed duty cycle
for the M3534 is 1%.

For branch circuit protection, steady state Class J Time Delay or equivalent fusing
should be used to support the requirement for 2x surge capability. The
recommended minimum current rating for the power source fusing is listed in Table
6-6 based on the DC bus current rating of the M3534. The maximum rating of the
steady state power source fusing should be 225A for cabinets with disconnects.

The field wiring sizes listed in Table 6-6 ensure a

10V drop for wire lengths of

100 feet and are compatible with the recommended steady state circuit branch
protection fusing listed. The wire gauge selected for field wiring to the M3534
should be equal to or greater than that listed in Table 6-6.

Use copper wiring rated 75°C or equivalent for field wiring terminals.

These devices do not provide motor overload protection.
Table 6-6: Minimum Input Power Wiring Sizes and Fusing
M3534
DC B
US
C
URRENT
R
ATING
M
INIMUM
C
IRCUT
B
RANCH
P
ROTECTION
F
USING
(C
LASS
J T
IME
D
ELAY
)
R
ECOMMENDED
F
IELD
W
IRING
S
IZES
20 A 15 A 12 AWG
40 A 30 A 10 AWG
85 A 70 A 6 AWG