Multi-level Terminal Blocks: Save 66% Din Rail Space

A multi-level terminal block with a 6.2mm pitch replaces three single-level blocks and cuts DIN rail use by 66%. Three feed-through terminals need about 18.6mm of rail. One double-level block needs 6.2mm. The freed width goes to relays, power supplies, or controllers.

What Is a Multi-Level Terminal Block?

A multi level terminal stacks two or more independent circuits inside one housing. Each level keeps its own conductor entry. The block mounts on standard DIN rail and shares accessories with single-level versions in the same series.

Single-Level vs. Multi-Level: Footprint Comparison

How Stacked Levels Work

A double-level terminal block places two circuits vertically in one body. Upper and lower conductor entries stay separately reachable. Technicians service lower wiring without removing upper connections. Cross-connection accessories fit the top level without blocking lower entries.

Where Space Savings Matter

Dense control cabinets gain most. Marshalling panels routing hundreds of I/O signals run out of rail width before panel height.

• 🌡️ Sensor wiring. Three-wire sensors map to triple-level blocks. One block replaces three.

• 🔌 Power distribution. A four-level block feeds four circuits from one rail position. Width per group drops from 80mm to 16mm.

A 96-loop marshalling panel using triple-level blocks saves over 1,100mm of rail width versus a single-level layout.

How to Calculate Rail Space Savings

1. Count the single-level blocks needed per loop.

2. Multiply that count by 6.2mm pitch.

3. Subtract the multi-level block width from the result.

4. Multiply by total loop count.

This formula assumes a 6.2mm single-level pitch. If single-level blocks use a 5.2mm pitch, savings fall to roughly 60%.

Double, Triple, or Four-Level: Selection Guide

🔹 Double-level: Two circuits. For 2-wire loops or paired signal/return wiring.

🔹 Triple-level: Three circuits. For 3-wire sensors and 3-phase distribution.

🔹 Four-level: Four circuits. For retrofits with fixed enclosure sizes.

A screw-connection multi level terminal blocks rated 4 mm² accepts 12 AWG wire and carries 32 A at 500 V. Torque is 0.6 Nm.

Installation and Compatibility

1. Pitch uniformity. Blocks in one series share 6.2mm pitch. Mixing double- and triple-level versions keeps rail alignment straight.

2. Access clearance. A 62mm block height fits standard enclosures and leaves screwdriver room.

3. Standards. Housing material meets UL94 V-0. Blocks are tested to IEC 60947-7-1 and UL 1059.

Frequently Asked Questions

Q: What is a multi-level terminal block? 
A: It is a DIN-rail terminal that stacks two or more independent circuits in one housing.

Q: How much rail space does it save?
A: A triple-level block saves about 66% compared to three single-level blocks.

Q: Can it accept 12 AWG wire?
A: Yes. A 4 mm² rated block accepts 12 AWG, which equals about 3.31 mm².

Q: Do multi-level blocks share accessories?
A: Yes. End covers, partition plates, and marking tags from the same series fit.

Q: Are they suitable for 4–20 mA loops?
A: Yes. Grouping signal and return on one block simplifies loop testing.

Model	Function	Wire IEC cross-section	Wire UL	Thickness	Maximum current	Number of packages	Thickness/Height()/Width mm	Rated voltage/rated current/rated cross-sectior
JHD5-4C		4 mm² 2.5 mm² 4 mm²	12 AWG 14 AWG 12 AWG	6.2 mm	32 A	100	6.2/62/56	500 V/32 A/4 mm²

Specfication: 

End cover	D4C
Cross-connection 10-Polo,Separable	ZL2-4 ZL3-4 ZL10-4
Insertion bridge 10-Polo,Separable	BLS2-4 BLS3-4 BLS10-4
Small Partition	CPK3
Marking tags	ZB6
Screw/Tightening torque(Nm)	M3/0.6
Material	PA
Flame retardant rating UL-94	V0
Dimensions

With universal mounting feet for standard top-hat(Ω profile) and G-profile DIN rail mounting.