March 2016
30
Quick Start Guide
Supply wire requirements
Use 10–18 AWG wire rated for the proper temperature of the application. For
wire 10–14 AWG use lugs or other appropriate connectors. For connections in
ambient temperatures above 122 °F (50 °C), use a wire rated for 194 °F (90 °C). For
DC powered transmitters with extended cable lengths, verify that there is a
minimum of 12VDC at the terminals of the transmitter with the device under
load.
Disconnects
Connect the device through an external disconnect or circuit breaker per national
and local electrical code.
Installation category
The installation category for the Rosemount 8750W is OVERVOLTAGE CAT II.
Overcurrent protection
The Rosemount 8750W Transmitter requires overcurrent protection of the
supply lines. Fuse rating and compatible fuses are shown in Table 11 and
Table 12.
Table 11. Field Mount Transmitter Fuse Requirements
Table 12. Wall Mount Transmitter Fuse Requirements
Field mount transmitter power terminals
See Figure 23 for field mount terminal connections.
For AC powered transmitter (90
–250VAC, 50/60 Hz)
Connect AC Neutral to terminal 9 (AC N/L2) and AC Line to terminal 10
(AC/L1).
For DC powered transmitter
Connect negative to terminal 9 (DC -) and positive to terminal 10 (DC +).
DC powered units may draw up to 1.2A.
Input voltage Fuse rating Compatible fuse
90-250VAC rms
1 Amp, 250V, I
2
t ≥ 1.5 A
2
s Rating,
Fast Acting
Bussman AGC-1, Littelfuse 31201.5HXP
12-42VDC
3 Amp, 250V, I
2
t ≥ 14 A
2
s Rating,
Fast Acting
Bel Fuse 3AG 3-R, Littelfuse 312003P,
Schurter 0034.5135
Input voltage Fuse rating Compatible fuse
90–250VAC 2 Amp, fast acting Bussman AGC-2
12–42VDC 3 Amp, fast acting Bussman AGC-3
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