PTR Terminal Blocks and Multi-Connector- Systems

With its terminal blocks and multi-connector-systems PTR has the ideal equipment for reliable electrical connections. The terminal block system consists of 2 and 3-pole devices which can be assembled to form a wide range of combinations. Terminal blocks using the terminal-screw principle (Fig. 1) are used where low contact resistance is required (Fig. 4). In this process the solder pin is directly attached to the connecting terminal, which means conductors can be connected with an extremely low voltage loss. Wire guards give reliable protection against damage to the conductors.

Terminal blocks designed on the lift principle are ideal for high-frequent disconnectings (Fig. 2). This means that electrical contact can easily be disconnected and restored.

PTR multi connector systems (Fig. 3) have decisive advantages.They can be rapidly dismantled for purpose of repairs and servicing, they avoid any mix-up with connections,and secondary printed-circuit boards can be extended with ease.

The carefully-chosen combination of materials and the high-quality finish mean minimal voltage loss, even after repeated plugging. The modular design of the 950 and 1550 series guarantees maximum stability.

Insulating Material

The insulating material of the terminal blocks consists of high-quality polyamide with flammability class V-0 (0,4 mm) in accordance with UL 94. Creep resistance in accordance with IEC 112/DIN 0303/Section 1 is > 600 V. Further electrical characteristics are listed in Table 1. The insulating material of the multi-connector-series also consists of unbreakable polyamide classified as V-0 under UL 94.The standard colours are grey or green. Alternative colours are also available on request. E.g. Types AK(Z) 130, AKZ 250,AK(Z) 300, AK(Z) 350 and AK(Z) 750 are firmly secured when joined together by a combination of dovetailing and interlocking which prevents any danger of accidental disconnection during transport or assembly.

Polyamide Ratings

      Flammability UL 94: V-0

      Tracking resist DIN EN 60112/DIN VDE 0303 Section 1: > 600 V (CTI)

      Volume resistivity IEC 93 / DIN 53482: 1013 Ohm

      Surface resistivity IEC 93 / DIN 53482: 1015 Ohm

      Temperature stability :-30 C/+105 C

Metal Parts

The thick layer passivated steel screws provide excellent protection against corrosion. Terminal blocks with nickel-plated bronze and Philips head style screws can be supplied for special applications. The connecting terminals of the terminal blocks which operate on the terminal-screw principle (AK 100, AK 110, AKZ 120, AK(Z) 130, AK(Z) 500 and AK 550) consist of a brass alloy, with the tin surface providing a high level of corrosion protection, low contact resistance and easy soldering. The wire guard made of stainless steel of phosphor bronze protects conductors against strain while ensuring good mechanical contact.

The clamps of the terminal blocks which operate on the lift principle (AKZ 250, AK(Z) 300, AK(Z) 350, AK(Z) 700, AK(Z) 710, AK(Z) 750, AK(Z) 950, AK(Z) 1100 and AK(Z) 1110) consist of a brass alloy, freed from stresses by adequate annealing procedures. The nickel-plated surface of the clamp combines with the tin-plated solder tag to ensure low contact resistance and maximum corrosion protection. A further advantage provided by tin-plating is ease of soldering.

Rated Cross Sections

The rated cross sections indicated in the technical data depend on the size of the biggest conductors to be connected. Where wire-end sleeves are used, rated cross sections one size below the indicated values are guaranteed, but a certification is not possible.

Creepage Distances and Air Gaps

The rated voltage of electrical connecting elements depends on creepage distances, air gaps and distances through potting compound. The EN 60998 distinguishes five voltage levels as follows:

      ≤ 130 V 1,5 mm

      > 130 V up to ≤ 250 V 3,0 mm

      > 250 V up to ≤ 450 V 4,0 mm

      > 450 V up to ≤ 750 V 6,0 mm

      0> 750 V 8,0 mm

In addition to its tried and tested screw-type principle and tension spring principle for terminal blocks and multi-connector systems, PTR is now also offering leg spring technology.

Because of their conductor-clamping technology, terminal blocks designed on the spring principle are especially suited to use under extreme conditions such as a high vibration or corrosion environment or extreme temperature fluctuations. The tension spring principle (Figure A) is suitable both to operation by screwdriver (insert, press) and by lever (Figure B).

The leg spring technology offers a high comfort for application with single wires, as the use is easy and timesaving: You can push the single wire into the clamp section without pressing the lever (Figure C).

The materials used guarantee lasting and reliable clamping and good electrical properties. For safety reasons, insulating sections are made of high-quality polyamide with the UL 94 classification of V-0. Spring Terminals can be ink-jet marked with numbers, lettering or symbols as required. Standard lettering is black, but white is also available for insulating sections with non-standard colours.

Figure A	Figure B	Figure C