Ground-Fault Circuit Interruption (Gfci) Breakers; Table 2-2, Minimum Wire Size To Circuit-Breaker Size; Table 2-3, Wire Color To Ac Wire Connection - Magnum Energy MMS Series Owner's Manual

Installation
or circuit-breakers, and must
wire they are protecting and the appliances being powered.
inverter's that are hardwired use a service/distribution panel wired to
the inverter's input (main panel), and a dedicated panel between the
inverter's output wiring and the AC loads (sub-panel). These systems
use the circuit breakers provided in the panels as the overcurrent
protection and the AC disconnect. If fuses are used, then separate
AC disconnect switches will be needed.
Based on information from the NEC, Table 2-2 provides the minimum
AC wire size and the suggested breaker size based on inverter model.
However, a larger wire size may be required because of voltage drop.
The AC wire sizes provided in this table assume using only copper
wire and a temperature rating of 75°C (167°F) or higher.

Table 2-2, Minimum Wire Size to Circuit-breaker Size

Inverter
Input
Model
Breaker
20
MMS1012
amps
MMS1012
20
amps
-G

2.4.3 Ground-Fault Circuit Interruption (GFCI) Breakers

In compliance with UL standards, Sensata has tested some GFCIs to
ensure they function properly when connected to the inverter's AC
output. See WARNING below.
WARNING: Risk of electric shock. Use only the following
GFCIs [receptacles or circuit breaker(s)]: Leviton 8899-
A, N7899, and the GFNT1 and GNNT2. Other types may
fail to operate properly when connected to this inverter.
CAUTION: GFCIs shall be installed in the recreational
vehicle's wiring system to protect all branch circuits.

Table 2-3, Wire Color to AC Wire Connection

Wire Color (label)
AC IN
AC OUT
AC Ground Green (GROUND)
22
be properly sized and rated for the
AC Input
Minimum Suggested
Wire Breaker
Size Size
#12
AWG
20
amps
(3.3 mm²)
#12
AWG
20
amps
(3.3 mm²)
Black (HOT IN)
White (NEU IN)
Red (HOT OUT)
White with black
stripe (NEU OUT)
AC Output
Output Minimum
Breaker Wire
Size
#14
AWG
15
amps
(2.1 mm²)
#14
AWG
15
amps
(2.1 mm²)
Wire Connection
Hot In
Neutral In
Hot Out
Neutral Out
AC IN & AC OUT Ground
© 2017 Sensata Technologies
Most
Suggested
Breaker
Size
15
amps
15
amps