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Main applications
These terminal blocks have been developed to allow the electrical connection of KA series explosion-proof thermostats with wired output in EX “e” increased security boxes. They allow quick mounting directly on the body of the thermostat, without the need for a DIN rail for fixing, and their footprint is reduced. They are approved for this application. Their assembly can also be done directly by screwing onto a mounting board.
They are intended for the connection of copper conductors inside enclosures.

Technical features

Dimensions: 40 × 41 × 6.8mm (40 × 41 × 8mm with side flange added)

Material: PA, UL94VO, GWFI 960°

Colors available: blue or black

Rated cross section: 4mm² (EN 60079-7) Solid core, stranded, finely stranded, or with wire-end ferrules

Minimum cross section: 0.5mm² (EN 60079-7) Solid core, stranded, finely stranded, or with wire-end ferrules

Maximum voltage: 550 V (ATEX, IECEX); 800V (IEC60947-7)

Maximum current: 32 A (ATEX, IECEX); 41A (IEC60947-7)

Environment pollution level: level 3

Ambient temperature limits:
Under normal operating conditions the temperature rise of the terminal blocks is max 40 K, (Measured with 110% of the maximum rated current as requested by standard). Due to the above mentioned the terminal blocks may be used in apparatus of temperature classes T6…T1 as long as the terminal block ambient temperature range is not exceeded as shown below. No part of terminal block must exceed 110°C under any condition.
T6 (- 60°C ≤ Tamb ≤ +40°C)
T5 (- 60°C ≤ Tamb ≤ +55°C)
T4 (- 60°C ≤ Tamb ≤ +70°C)

Installation:
- Can be mounted directly on the body of KA thermostats using two M3 screws, without requiring a 35mm DIN rail, the mounting is identical for the 4mm² and 6mm² models which can be installed side by side.
- Can be mounted directly on a board by drilling a 4mm hole for M4 screw, with a square nut in the PA base
- ROHS and Reach compliants

Accessories :
- Shunts allowing the electrical connection of terminal blocks of the same section side by side without using wire connection terminals.
- 3 × 7mm rail allowing the terminal blocks to be joined together when a long assembly length is mounted on the body of the thermostat
- Snap-on partition for closing at the end of a row or as a separation between blocks of different polarity

Approvals: IEC Ex certificate of conformity (ATEX for joint use with KA thermostats already ATEX/IECEx approved)

Marking: Ex eb II C Gb (EN 60079-7). II 2 G Du (European standard Ex 2014/34/EU)

Earth connection block: see specific page.