In electrothermal connection blocks, the requirements are higher than in standard applications: high ambient
temperature, frequent thermal cycles, proximity of the ends of the heating elements and their terminals, in a
confined space making it difficult for the user to make the wiring.
These terminal blocks have been developed to meet these constraints. However, as they are not protected
against accidental electrical contact, they are intended for internal wiring inside enclosures.
Main features, identical for all types
Body: Fiberglass-filled Polyamide 66, UL94V0, GWFI (Glow wire flammability index) 960°C, ambient temperature
up to 200°C. Heat deflection temperature under 1.8 MPa load according to ISO 75: 226°C. Halogens free.
Terminals: M3 screw terminals, captive with the screw elastic toothed washer, resistant to loosening by vibrations
or thermal cycles. These terminals can receive conductors equipped with fork or eyelet wire end terminals but
this termination limits the clamping capacity to a single conductor. Cables equipped with cable shoes are limited
to 1.5mm² maximum cross-section. The M3 screw can adapt a 4.8mm tab, and jumpers for the interconnection of
the terminals are available (see the accessories page)
They are also available with one side equipped with solder terminals and the other with screw terminals. But
when terminal blocks have solder terminals, this side can only receive one conductor from 1 to 2.5mm².
Voltage: 400V. The creepage distances between 2 terminals or between live and ground terminals are equal to or
greater than 5mm, and clearances in air greater than 3mm (§18.104.22.168 and 22.214.171.124 of EN60947-7-1)
Wire gauge: Unless otherwise specified, each terminal equipped with screw and square washer accepts on each
side one or two conductors from 1mm² to 2.5mm². (AWG 18 to AWG14).
Maximum rating per terminal: 24 A, corresponding to a self-heating of the terminal lower than 45°C, required by
Other models: similar PA66 terminal blocks for special immersion heater applications have also been developed:
see catalog no. 11