78 Series 13mm Barrier Terminal Blocks

78C A Barrier Terminal
78C B Barrier Terminal
78H A Barrier Terminal
78H B Barrier Terminal
78R A Barrier Terminal
78R B Barrier Terminal

Series Part Number

Part Number: ULO - TB37 - 78H / A - 02 P - 3 100A
Explanation:

Brand

Series Code

TB37 - Fixed code for the five configurations covered here: 78C/A, 78C/B, 78H/A, 78H/B and 78R/B

Termination

78C - Straight PCB pins; A or B body
78H - Extended eyelet tails; A or B body
78R - Bent PCB pins; B body only within this ordering breakdown

Body

A - End mounting extensions; 78C or 78H
B - Compact ends; 78C, 78H or 78R

Positions

02–16 - 78C/A or 78C/B
02–24 - 78H/A, 78H/B or 78R/B; two-digit count

Position Suffix

Colour

1 - Grey
2 - Blue
3 - Black
4 - Green
5 - Orange
6 - Red
7 - Transparent
8 - Yellow
9 - White

Customer Requirements

000A - 78C/A or 78C/B
100A - 78H/A, 78H/B or 78R/B; exact suffixes shown in their drawings

Description

Body and termination selection

The 78 series uses one row of screw connections on 13mm centres. C models have straight PCB pins, H models have extended eyelet tails, and R models have bent pins. A bodies include end mounting extensions; B bodies omit those extensions.

ModelTerminationBodyPositionsMetric wire rangeStrip length
78C/AStraight PCB pinsA, mounting extensions2–160.75–6mm²Unspecified
78C/BB, compact ends
78H/AExtended eyelet tailsA, mounting extensions2–240.5–6mm²9–10mm
78H/BB, compact ends
78R/ABent PCB pinsA, mounting extensions2–16Unspecified
78R/BB, compact ends2–249–10mm

IEC electrical ratings by model

ModelCategory III / pollution degree 3Category III / pollution degree 2Category II / pollution degree 2CurrentImpulse voltage
78C/A, 78C/B800V1250V1600V41A8kV
78H/A, 78H/B600V
78R/AVoltage unspecified630VVoltage unspecified
78R/B1000V

UL ratings

ModelRating / use groupVoltageCurrentWire range
78C/A, 78C/BGeneral UL rating; use group unspecified600V40A18–10AWG
Use group D5A
78H/A, 78H/B, 78R/BUse groups B and C40A
Use group D5A
78R/AUse groups B and C38A
Use group D5A

Connection and materials

CharacteristicSpecification
Pitch / rows13mm / 1
Conductor connectionM4 screw; 1.2N·m torque, approximately 10.53lb·in
Operating temperature-40–105°C
Protection ratingIP20
HousingPA66; material group I; UL94V-0
78C/A and 78C/B conductorsTin-plated brass
78H/A, 78H/B, 78R/A and 78R/B contactsTin-plated copper alloy
78C/A, 78C/B, 78H/A, 78H/B and 78R/B screwsNickel-plated steel
78C/A, 78C/B, 78H/A, 78H/B and 78R/B coverPC; UL94V-2

Solid, flexible and ferruled conductor selections are listed for the family. Apply each model's metric range above. Cover material and screw finish are unspecified for 78R/A.

78C straight-pin dimensions

N is the number of positions. Both C models have an 18mm body depth, 22mm height, 2×1mm pin section and a 4mm pin projection. The pin row lies 9mm from the indicated body edge.

Reference78C/A78C/B
Overall length13×(N+2)mm13×N+3mm
Central body length13×N+3mm
Contact span13×(N−1)mm
Mounting-hole centres13×(N+1)mmNo end mounting holes
Mounting-hole referencesØ5mm through hole; Ø8.50mm surrounding referenceNot applicable
PCB signal holesØ2.70mm on 13mm centres
First / last hole to end19.50mm8mm
Other body references9.40mm / 10.40mm lower profile; 10mm top section10.40mm lower profile; 10mm top section
78C A mounting flanges straight pins and PCB holes
78C/A straight-pin outline and PCB footprint.
78C B compact ends straight pins and PCB holes
78C/B straight-pin outline and PCB footprint.

78H eyelet-tail dimensions

Reference78H/A78H/B
Overall length13×(N+2)mm13×N+3.3mm
Contact span13×(N−1)mm
Mounting-hole centres13×(N+1)mmNo end mounting holes
Mounting-hole referencesTwo Ø4.5mm holes; Ø8mm surrounding referencesNot applicable
Body depth / cover width / height18mm / 20mm / 22mm
Eyelet tail width / thickness5.00±0.1mm / 1.00±0.1mm5.00±0.05mm / 1.00±0.05mm
Tail projection / eyelet hole10.40±0.3mm / Ø3mm
PCB slot size5.70×1.70mm on 13mm centres
Additional profile references9.40mm / 5.20mmAs illustrated
78H A extended eyelet tails and slotted PCB footprint
78H/A eyelet-tail dimensions and mounting layout.
78H B extended eyelet tails and slotted PCB footprint
78H/B eyelet-tail dimensions and mounting layout.

78R bent-pin dimensions

Reference78R/A78R/B
Overall length13×(N+2)mm13×N+3.3mm
Central body length13×N+3.3mm
Contact span13×(N−1)mm
Body depth / cover width18mm / 20mm
Height reference20mm body / 22mm with cover22mm
Tail section2×1mm2.0±0.1mm tip width; 4.00±0.1mm shoulder; 1.00±0.1mm thickness
Bent-tail side projection3.50mm3.35±0.3mm
Tail drop4.70mm4.70±0.3mm
PCB holesØ2.70mm2.70×1.70mm slots
78R A bent pins body length and PCB holes
78R/A bent-pin outline and PCB layout.
78R B bent pins shoulder dimensions and PCB slots
78R/B bent-pin outline and PCB layout.

Ordering fields

Specify the TB37 series, the complete 78C/A, 78C/B, 78H/A, 78H/B, 78R/A or 78R/B model, and the two-digit position count within its listed range.

FieldSelection
Colour code1 grey; 2 blue; 3 black; 4 green; 5 orange; 6 red; 7 transparent; 8 yellow; 9 white
General screw-head field0 slotted; 1 cross-head
General clamping-direction field0 screw down; 1 screw up
Standard-product suffix0A

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