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Manufacturer Resources
Product Specs
- Certifications:
- UL Listed
- Degree Of Protection:
- NEMA 4
- Product Category:
- Security latch inserts
- Product Height:
- .11 in
- Product Length Depth:
- 1 in
- Product Weight:
- .35 lb
- Product Width:
- .11 in
- Department:
- Electrical
- Product Type:
- Slotted flush latch
- Product Details:
- Slotted flush latch
B-LINE 3MDBLK – Frequently Asked Questions
1) What kind of key does the Eaton B-Line 3MDBLK latch insert take?
It is a 3mm double bit insert, so it opens with a 3mm double bit (double square) key or wrench rather than a standard handle or padlock. That is the common utility-panel key style used to keep electrical enclosures out of reach of untrained personnel while letting maintenance staff carry one key for the whole set of cabinets.
2) Will a security latch insert like the 3MDBLK keep an enclosure watertight?
The 3MDBLK insert is rated NEMA 4, which covers hosedown and windblown rain when installed in a matching NEMA 4 enclosure door. It is a flush slotted latch, so nothing protrudes to catch a seal or get knocked. The enclosure and gasket have to be NEMA 4 too; an insert alone will not upgrade a lesser rated box.
3) Is the 3MDBLK a complete latch or just the insert?
It is the insert, the keyed element that drops into a B-Line enclosure latch body. If you are replacing a whole latch assembly or a handle, the insert on its own will not do the job. Order it when the latch mechanism is sound and you are changing or adding the 3mm double bit security element.
4) How big is the 3mm double bit latch insert, and does it sit flush with the door?
Small part: 1 inch length/depth with .11 inch height and .11 inch width, weighing .35 lb. It is a flush design, so the operating face finishes level with the enclosure door instead of standing off it, which matters where cabinets sit in a walkway or beside a door swing.
5) Can I standardize all my electrical cabinets on one key with these inserts?
Yes, that is the usual reason to buy them. Every 3MDBLK takes the same 3mm double bit key, so fitting the same insert across a bank of enclosures means maintenance carries one key instead of a ring. Note this is keyed-alike by design, not keyed-different, so it restricts access to trained staff rather than separating access between departments.
6) Which part number do I order for the B-Line 3mm double bit security insert?
The manufacturer part number is 3MDBLK. It is a single configuration, so there are no finish or size choices to specify when you order.
How fast can I get the B-LINE 3MDBLK delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
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 B-LINE 3MDBLK come with a warranty?
Absolutely. The B-LINE 3MDBLK is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the B-LINE 3MDBLK?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the B-LINE 3MDBLK from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.