Pepperl+Fuchs K-System Isolated Barriers

Product Specifications

Function

Isolated barriers are isolators used for protection of intrinsically safe circuits in hazardous

areas. In addition to the required current, voltage and power limitation, the isolated barriers

have a galvanic isolation between the field circuit and the controller.

The K-System consists of wide range of isolated barriers suitable for mounting on 35 mm

DIN mounting rail. K-System is easy to specify, integrate and expand. Our extensive line

of intrinsic safe isolators for hazardous location applications contains over 150 different

devices.

Housing Styles

Depending on the functionality and application, K-System devices have 3 different housing

widths:

• KC devices with 12.5 mm width

• KF devices with 20 mm width

• KF devices or KHdevices with 40 mm width

The 3 housing widths versions have the same system characteristics. All devices

can be mounted on the 35 mm DINmounting rail or the Power Rail. See chapter 2.9

Terminals

Removable Terminal Blocks

The KC and KF devices have removable terminal blocks.

The removable terminal blocks simplify connection and control cabinet assembly.

The terminal blocks offer space for the connection of leads with core cross-sections

of up to 2.5 mm2 (14 AWG). The terminal blocks are coded with red coding pins

so misconnection of terminal blocks are eliminated.

Observe the tightening torque of the terminal screws. The tightening torque

is 0.5 Nmto 0.6 Nm.

The 20mm and 40mm wide KFdevices are factory-equipped with screw terminals.

The KC devices are available with screw terminals or spring terminals. The order designation

of the versions of the KC devices with spring terminals has the extension .SP.

As an alternative to the factory-equipped terminal blocks the devices can be used with other

terminal blocks:

• Terminalblocks with screw terminals

• Terminalblocks with screw terminals and test plug socket

• Terminalblocks with spring terminals and test plug socket

These terminal blocks are available as accessories. The terminal blocks can be easily coded

with KF-CP coding pins (available optionally).

Protection against direct contact

The removable terminal blocks have different heights:

• Height 15mm (1), (2), (3): These terminal blocks are used in applications that have rated

voltages lower than 50 V AC. The insulation of the removable terminal blocks provides

protection against direct contact. The insulation corresponds to a reinforced insulation

according to EN 61010-1 for a rated insulation voltage of 50 V AC.

• Height 15.5mm (4), (5): These terminal blocks are used in applications that have rated

voltages higher than 50 V AC. The insulation of the removable terminal blocks provides

protection against direct contact. The insulation corresponds to a basic insulation

according to EN 61010-1 for a rated insulation voltage of 300 V AC. The higher terminals

are X marked.