Section 4: Accessory Devices; Plug-In Electrical Accessories - Eaton IZM97 Instruction Manual

Section 4: Accessory devices

Section 4: Accessory devices
A variety of accessory devices are available for use with the
circuit breakers. Unless otherwise stated, they are all consid-
ered optional devices in the sense that they are not provided
as standard on a manually operated circuit breaker. Available
accessories are identified here and discussed in general
terms. For more detailed information and/or installation
instructions, refer to individual instruction leaflets dedicated
to the accessories.
The circuit breaker accessories are designed to fit all frame
sizes.
The accessories fall into one of three categories:
• Plug-in electrical
• Internal electrical
• Mechanical

4-1 Plug-in electrical accessories

There are four plug-in electrical accessories. Three can be
viewed for identification by name and rating through view-
ing windows located in the right front of the circuit breaker
(Figure 4-1). All four are plug-in type and can be factory
installed or field installed.
The four plug-in accessories are:
• Shunt trip (ST)
• Spring release (SR)
• Undervoltage release (UVR)
• Auxiliary switch (AUX)
Shunt trip—The shunt trip is an optional device on circuit
breakers (Figure 4-2 and Figure 4-3). It opens the circuit
breaker instantaneously when its coil is energized by a
voltage input (Table 4.1). A total of two shunt trips can be
mounted on a circuit breaker.
Table 4.1 Shunt trip ratings
Control Operational voltage
voltages range 70-110%
24 Vdc 17-26 Vdc
48 Vdc 34-53 Vdc
110-125 Vdc 77-138 Vdc
220-250 Vdc 154-275 Vdc
110-127 Vac 77-140 Vac
208-240 Vac 146-264 Vac
 Required for less than 35 ms.
24 New generation IZM97, 99 low voltage air circuit breaker instruction manual MN013010EN February 2020 www.eaton.com.cn
Inrush power Opening

consumption time (ms)
250 W 35
250 W 35
450 W 35
450 W 35
450 VA 35
450 VA 35
Accessory viewing windows
Figure 4-1 Through-the-window electrical accessories
Figure 4-2 Shunt trip with cutoff switch
Figure 4-3 Shunt trip switch installed