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NSi Industries ITB Insulated Terminal Block, Modular Nylon 66
The NSi Industries ITB Insulated Terminal Block is a modular, touchproof terminal block available in amperage ratings from 35A to 50A, giving installers a single family of connectors sized to match circuit load requirements. Built with a Nylon 66 housing and brass metal alloy, nickel-plated terminal inserts, the ITB series connects stripped solid or stranded un-terminated wire directly to each tubular contact for fast, reliable field wiring. Zinc-plated, yellow-chromed screws and recessed screw design add corrosion resistance and additional protection against accidental contact during installation and maintenance.
Key Features
- Amperage Range: Offered in 35A and 50A ratings so the correct block can be matched to the circuit's current-carrying needs.
- Durable Construction: Nylon 66 housing provides 'touchproof' safety, paired with a brass metal alloy, nickel-plated terminal insert for solid, low-resistance connections.
- Wire Protection: Integrated stainless steel spring wire protectors prevent twisting and breaking of stranded wires during installation.
- Safety Design: Recessed screws and tubular contacts provide additional safety and help prevent short circuits.
- Direct Wire Connection: Tubular contacts connect stripped solid or stranded un-terminated wire directly to each contact without additional lugs.
- Modular Design: The connector can be cut into smaller sections or stacked end-to-end to build custom terminal block runs.
- Finish: Zinc-plated, yellow-chromed screws resist corrosion over repeated use.
Certifications & Compliance
- UL Recognized
- UL 94V-2
- CSA
Technical Specifications
- Amperage Options: 35A, 50A
- Housing Material: Nylon 66
- Terminal Insert: Brass metal alloy, nickel plated
- Screw Finish: Zinc plated, yellow chromed
- Wire Protection: Stainless steel spring wire protectors
Typical Applications
- Junction Box and Control Panel Wiring
- Motor Control and Distribution Terminations
- Panelboard and Equipment Terminal Connections
- Commercial and Industrial Electrical Installations
- Modular Terminal Block Assemblies
Why NSi?
NSi Industries builds the ITB terminal block series with UL Recognized, UL 94V-2, and CSA compliant materials, combining a touchproof Nylon 66 housing with nickel-plated brass terminal inserts for dependable, code-compliant connections. The integrated wire protectors, recessed screws, and modular stacking design make the ITB series a practical choice for electricians who need flexible, safe terminal blocks across a range of amperage requirements.
Manufacturer Resources
Product Specs
- Department:
- Electrical
- Product Group:
- Wire Connectors & Terminals
- Product Type:
- Terminal Block
- Product Material:
- Nylon 66
- Amperage Rating:
- 35A - 50A
- Product Finish:
- Zinc-Plated
- Configuration:
- Modular
- Listing:
- UL Recognized
- Standards:
- UL 94V-2
- Product Subgroup:
- Terminal Blocks & Strips
NSi ITB35-12 – Frequently Asked Questions
1) What amperage ratings does the NSi ITB terminal block come in, and which one do I order?
Two ratings: 35A (part ITB35-12) and 50A (part ITB50-12). Pick the block whose rating meets or exceeds the current the circuit carries, not the wire size you happen to have on hand. Both share the same Nylon 66 body and nickel-plated brass inserts, so the only difference in the family is current capacity.
2) Can I cut an ITB terminal block down to fewer poles?
Yes. The ITB is a modular strip that can be cut into smaller sections, and sections can be stacked end to end to build a longer run. That means one 12-pole block covers a 4-pole job and a 20-pole job without stocking multiple part numbers.
3) Do I need crimp lugs or ferrules to land wire in this block?
No lugs needed. The ITB uses tubular contacts that accept stripped solid or stranded un-terminated wire directly under the screw. Stainless steel spring wire protectors inside each contact keep stranded conductors from twisting or breaking as the screw is tightened, so you can land fine strands without a ferrule.
4) Is the NSi ITB block UL listed or only UL Recognized?
UL Recognized, not UL Listed. It is a component intended for use inside other equipment such as a panel, junction box, or control enclosure, and the inspector will look at the assembly it goes into. The housing material carries a UL 94V-2 flammability classification, and the block is CSA compliant.
5) What is the difference between the NSi ITB terminal block and a DIN-rail feed-through block like the ABB ZS4-T3?
The NSi Industries ITB is a modular insulated terminal block with a Nylon 66 housing and nickel-plated brass tubular contacts, rated 35A to 50A; it is built to be cut into smaller sections or stacked end-to-end to build a custom run, with stripped solid or stranded wire landing directly in each contact. The ABB ZS4-T3 is a feed-through screw clamp terminal block in the ABB 1SNK5 series, a single-position block of the type mounted individually on rail rather than cut from a multi-pole strip. Choose the ITB when you want to size a block strip to the pole count you need inside a junction box or control panel; choose an individual feed-through block when the panel is built around rail-mounted blocks.
6) I need a terminal block for a circuit above 50A - what should I use instead of the NSi ITB?
The NSi ITB family is offered in 35A and 50A ratings, so a load beyond that needs a different block. The Square D TeSys GV2 top feed terminal block is a 3-pole block rated 63A at 690V, intended for use with TeSys D and TeSys U devices, which covers a higher-current three-phase termination than the ITB range. If your termination is instead a higher-voltage control application, the Eaton XBT XB Series wide feed-through block is rated 800V.
7) Will the Eaton 10250TA62 work as a substitute for an NSi ITB terminal block?
No - they solve different problems despite both being called terminal blocks. The Eaton 10250TA62 is a terminal block for 30.5mm heavy-duty pushbuttons in the Eaton 10250T series, meaning it is a contact/terminal module that mounts to a pushbutton operator. The NSi ITB is a standalone insulated wiring block in Nylon 66 with nickel-plated brass inserts, rated 35A to 50A, used to land field wiring in junction boxes, control panels, and panelboards. If you are wiring a 30.5mm operator, you need the Eaton part; if you are terminating branch or control conductors, you need the ITB.
8) Is this terminal block safe to work on with the panel energized nearby?
The ITB is built as a touchproof block: the Nylon 66 housing encloses the current-carrying parts and the screws are recessed so a screwdriver or finger is less likely to bridge adjacent poles. Tubular contacts also keep stray strands contained, which is what usually causes a phase-to-phase short on an open barrier strip.
9) How is this different from a DIN rail terminal block like the ABB ZS4-T3 or Eaton XB series?
The NSi ITB is a modular insulated strip you cut to length and mount in the box, wired directly under a screw with no lugs. The ABB ZS4-T3 is a feed-through screw clamp block and the Eaton XBT XB Series is an IEC wide feed-through block rated 800V, both of the DIN-rail feed-through style used where a panel is already built around a rail and single-circuit blocks are added or removed individually. If your enclosure has DIN rail and a documented rail layout, go the feed-through route; for a junction box or a retrofit with no rail, the ITB strip is the simpler termination.
10) I need a terminal block for a motor starter feed. Is the ITB the right part?
For landing branch conductors and control wiring in a panel or junction box up to 50A, yes. But if you are feeding a specific starter, the block that bolts to it is a different animal: the Square D TeSys GV2 top feed terminal block is a 3-pole 63A/690V block made for TeSys D and TeSys U starters, and an Eaton 10250TA62 terminal block is matched to 30.5mm heavy-duty pushbuttons. Those are device-specific accessories; the ITB is a general-purpose wiring block.
11) Can I mix solid and stranded conductors in the same ITB block?
Yes. Each tubular contact takes stripped solid or stranded wire directly, so a run can have solid branch conductors in some poles and stranded in others. Strip clean, seat the conductor fully in the tube, and the spring wire protector does the work of keeping strands together under the screw.
12) For a high-voltage control panel, how does the Eaton XB Series feed-through block compare to the NSi ITB?
The Eaton XBT XB Series is an IEC-style wide feed-through terminal block rated 800V, so it is specified where the panel voltage drives the selection. The NSi ITB is specified by current instead, in 35A and 50A ratings, with a UL Recognized, UL 94V-2, CSA-compliant Nylon 66 touchproof housing and recessed screws for protection against accidental contact. The ITB also differs in form: it can be cut into smaller sections or stacked end-to-end, where the XB Series is an IEC block built around rail-mounted assembly.
13) If I am standardizing a motor control panel on TeSys starters, do I still need a block like the NSi ITB?
They typically serve different points in the same panel. The Square D TeSys GV2 top feed terminal block is a 3-pole 63A/690V block made to feed TeSys D and TeSys U devices directly, so it handles the line side of the starter. The NSi ITB, in 35A and 50A ratings with nickel-plated brass tubular contacts that accept stripped solid or stranded wire without lugs, is the general-purpose block for landing control and distribution conductors elsewhere in the enclosure, and it can be cut or stacked to match the number of terminations you need.
14) Will these screws hold up in a damp or corrosive environment?
The screws are zinc plated and yellow chromed, which resists corrosion through repeated tightening, and the terminal inserts are nickel-plated brass for a low-resistance connection. That combination suits indoor panel, junction box, and equipment terminations; it is not a rating for direct outdoor or wet-location exposure on its own, so it belongs inside a suitable enclosure.
How fast can I get the NSi ITB35-12 delivered?
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Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the NSi ITB35-12 come with a warranty?
Absolutely. The NSi ITB35-12 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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