A 6mm multi-level terminal block terminates three motor phases plus a protective conductor in one housing. The unit stacks four circuits vertically within a 6mm pitch, rated 32A at 500V AC with 4mm² cross-section. Compared with four separate single-level blocks, it cuts DIN rail occupation by roughly 75%. This layout suits compact control cabinets, OEM machine panels, and motor feeder circuits where rail length runs short. The block accepts rigid and flexible copper conductors, mounts on 35mm DIN rail, and carries an IP20 protection degree.

What the Block Does in a Motor Feeder

Three Phases and PE in One Housing

The stacked design places L1, L2, and L3 on separate levels. A PE foot contacts the mounting rail directly. Phase bridges replace external jumpers between blocks.

Ratings to Verify

Parameter	Value	Reference
Pitch width	6mm	Datasheet
Rated cross-section	4mm²	IEC 60947-7-1
Rated current	32A	UL 1059
Rated voltage	500V AC	IEC 60947-7-1
Protection degree	IP20	IEC 60529

Why Rail Space Matters

A conventional layout needs four positions per motor: three phases plus ground. Each position adds rail length, jumper wiring, and misconnection points.

A multi level terminal blocks layout consolidates all four terminations at one point. On a 200mm rail, motor circuit count rises from eight to roughly thirty-two.

Benefits include:

🔧 Fewer jumper wires between blocks
📉 Lower risk of wiring errors during assembly
📏 More horizontal rail space for contactors and relays
⚡ Shorter conductor runs inside the enclosure

Wiring Steps for a Three-Phase Motor

Confirm motor full-load amps sit below the 32A rating.
Strip conductors to 8–10mm, per the specification sheet.
Insert L1, L2, L3 into the upper levels; place PE in the PE level.
Tighten screws to 0.6–0.8 N·m.
Install the phase bridge to feed downstream devices.
Test each level through the function shaft without removing conductors.
Verify PE continuity between the terminal and the rail.

Selecting the Right Unit

Current, Voltage, and Cross-Section

Motor full-load amps must not exceed 32A. Both rigid and flexible 4mm² wire fit the clamp. Ferrules are advised for flexible conductors to stop strand fanning.

PE and Grounding

A PE foot contacting the rail removes the need for a separate grounding terminal. The connection must remain low-resistance and independent of phase bridges.

Accessory Compatibility

Check that phase bridges, marker strips, and test probes match the chosen multi level terminal. Confirm 35mm DIN rail mounting before ordering.

Selection checklist:

Current rating ≥ motor full-load amps
Voltage rating ≥ system voltage plus margin
Cross-section range covers installed wire
PE type suits the grounding scheme
Bridges available for phase distribution

Vibration and Fault Conditions

Self-Locking Screw Mechanism

Motor circuits run under continuous vibration. A self-locking screw mechanism maintains clamping force, preventing loosening that leads to resistance heating.

Thermal Derating

Side-by-side mounting raises ambient temperature around the block. Reduce current accordingly, following the derating curve in the specification sheet. The terminal does not replace upstream breakers or contactors.

Failure Mode	Cause	Prevention
Screw loosening	Vibration	Self-locking mechanism
Overheating	Loose joint or overload	Torque check, derating
PE discontinuity	Poor rail contact	PE foot inspection
Bridge mismatch	Wrong accessory	Verify compatibility

Common Questions

Q: Can a 6mm block carry 32A continuously?
A: Derate for ambient temperature and adjacent blocks; consult the specification sheet.

Q: Does it accept 4mm² flexible wire?
A: Yes, with ferrules recommended.

Q: Is a separate PE terminal needed?
A: Not when the block has a PE foot in solid rail contact.

Q: How many motor circuits fit on 200mm of rail?
A: One circuit occupies one 6mm position, so about thirty-two, minus spacing margin.

Q: Does it meet IEC 60947-7-1?
A: Confirm the certificate for the exact model before claiming compliance.

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/2		4 mm² 2.5 mm² 4 mm²	12 AWG 14 AWG 12 AWG	6.2 mm	32 A	100	6.2/62/67	500 V/32 A/4 mm²

Specfication:

End cover	D2.5C/2
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.

Multi-level Terminal Blocks

6mm Multi-level Terminal Blocks: How A Compact Footprint Completes Three-phase Motor Wiring