NSi Industries 251-MB - 3/4" DRY PUSH-EMT® Connector
NSI Industries

251-MB

UPC: 781747232519


Documents & Media
Installation InstructionsSpecification SheetVideo ClipWarranty

Contact for Pricing

Minimum Qty: 25

Multiplier: 25

*Contact for lower quantities*

Overview

The NSI Industries 251-MB is a 3/4" DRY PUSH-EMT® Connector designed for fast, tool-free installation in electrical systems. This connector uses a push-in 'Hit-Lock' method to secure non-metallic sheathed cables (#14-3, #12-3, #10-3, #8-3, #6-3) or combinations like 1 #12-2 and 1 #10-2. The high-impact thermoplastic housing with a steel insert ensures durability, while the removable design allows for adjustments. No locknut or special tools are required, reducing labor time by up to 50% compared to traditional methods. Ideal for HVAC, chemical processing, and water treatment systems where speed and reliability are critical.
  • Tool-free push-in installation with Hit-Lock design for quick, secure connections
  • Compatible with #14-3, #12-3, #10-3, #8-3, #6-3 cables or 1 #12-2 and 1 #10-2
  • High-impact thermoplastic housing with steel insert for durability
  • Removable design allows for adjustments and reusability
  • No locknut or special tools required, reducing installation time

Specifications

Application
The 251-MB is used to connect a properly deburred length of EMT raceway to a box or electrical enclosure. Simply push the fitting onto raceway with a slight twist. Remove the fitting by unthreading it from conduit end. No tools are required. Concrete Tight. Dry locations only. Patented
Connection Type
Push-in
Connector Type
PUSH-EMT®
Finish
Ball burnish
Insulation
False
Material Quality
Zinc Alloy body and locknut with steel internal components
Size
3/4 IN
Size
3/4"
Special Features
Concrete tight
Standard
cULus
Trade Size
3/4 in.
Type
Connector
Package Weight (Imperial)
0.139 L
Package Weight (Metric)
0.063 kg

Similar Products

251-MBI


Temperature Rating, Maximum: 221.00000 F

Temperature Rating, Minimum: 221.00000 F

Insulation: Insulated Throat

251-MSRT


Material Quality: Zinc Die Cast

Material: Steel

Ip Rating: IP66/IP67

251-MSRTI


Temperature Rating, Maximum: 221.00000 F

Temperature Rating, Minimum: 221.00000 F

Insulation: Insulated Throat

251-DC2


Standard: UL, CSA

Material Quality: Zinc Die Cast

Connector Type: Compression

251-DCI2


Special Features: Concrete-tight

Standard: UL, CSA

Temperature Rating, Maximum: 221.00000 F

251-RT2


Special Features: Raintight

Material Quality: Zinc Die Cast

Connector Type: Compression

Frequently Asked Questions

What is the material of the 251-MB connector?

The 251-MB connector is made of a zinc alloy body and locknut with steel internal components.

Is the 251-MB suitable for wet locations?

No, the 251-MB is designed for dry locations only.

What is the trade size of the 251-MB?

The trade size of the 251-MB is 3/4 inch.

How is the 251-MB connector installed?

The connector is installed by pushing it onto a properly deburred length of EMT raceway with a slight twist; no tools are required.

What certifications does the 251-MB have?

The 251-MB is certified under UL Standard 514B and meets Federal Specification A-A-50553 and NEMA Standard FB-1.

How do you remove the 251-MB connector?

To remove the connector, unthread it from the conduit end.

Is the 251-MB connector patented?

Yes, the 251-MB connector has several patents, including numbers 8,274,000 and 8,487,197.

Where is the 251-MB manufactured?

The 251-MB connector is manufactured in the USA.

What is the finish of the 251-MB connector?

The 251-MB features a mirror finish with a ball burnish.

What is the packaging quantity for the 251-MB?

The standard package quantity for the 251-MB is 250, with a unit quantity of 25.

Frequently Asked Questions about NSi Industries

What technical support does NSi Industries offer?

NSi Industries offers dedicated technical support through their toll-free technical support line at 888.500.4598. They are committed to customer satisfaction and promise to make every reasonable effort to remedy any product or service issues. Additionally, customers can contact their customer service team at 800.321.5847 or email [email protected] for further technical assistance.

What are the key features of NSi Industries products?

NSi Industries products feature exceptional versatility, reliability, and safety across multiple industrial automation categories. Key features include insulation piercing connectors with no wire stripping required, watertight and corrosion-free designs, wide wire range compatibility (from #14 AWG to 750 MCM), and the ability to install on energized conductors. Their product lines like Easy-Tap™ Connectors and TORK® Digital Timers demonstrate advanced capabilities such as turbo spacers, double shear-head bolts, astronomic scheduling, and enhanced switching technologies.

What environmental ratings do NSi Industries products have?

NSi Industries enclosures feature robust environmental ratings, including IEC 60529 IP66 certification, NEMA Type 1, 2, 3, 4, 4X, 12, and 13 ratings, and UL/CSA standards. Their products are designed for both indoor and outdoor applications, with protection against dust, water, corrosion, and extreme temperatures ranging from -40°F to 266°F.

How are NSi Industries products typically installed?

NSi Industries products are typically installed using detailed mechanical and digital wiring diagrams that specify precise connection methods for various voltage configurations (120V, 208V, 240V, 277V, 480V). Installation involves carefully following product-specific wiring schematics, which include clear terminal block connections, ground wire specifications, and phase alignment requirements. Professional electricians and technicians should reference the specific product's wiring diagram to ensure correct installation and electrical compliance.

What industries and applications are NSi Industries products used for?

NSi Industries provides electrical and automation products for diverse industrial applications, including lighting control, electrical enclosures, wire management, connectors, and sensor technologies. Their product lines serve commercial, industrial, and infrastructure markets with solutions for electrical infrastructure, control systems, and safety-critical environments.

What are the main product lines offered by NSi Industries?

NSi Industries offers a comprehensive range of industrial products including TORK® Photocontrols, Polaris™ Lighting Controls, Easy-Twist™ Grounding Solutions, Miniterms, Cable Ties, Connectors, Enclosures, Occupancy Sensors, and Wire Management systems. Their product lines span electrical components, control devices, and industrial automation accessories designed for diverse applications in commercial and industrial settings.

What accessories are available for NSi Industries products?

NSi Industries offers a range of accessories for their product lines, including photocontrol accessories like replacement caps, mounting brackets, and receptacles. Specific accessories include shorting caps, open caps, 3-pin and 7-pin receptacles, and utility mounting brackets for conduit photocontrols. For specialized applications, NSi recommends contacting their customer service team to discuss custom accessory needs.