170M Fuse Dimensions, Terminal Types and Datasheet Guide
When selecting or replacing a high-speed fuse, the physical interface matters as much as the headline electrical ratings. A fuse can have a suitable current rating and still be incompatible with the equipment because of its body size, terminal arrangement, mounting dimensions, bolt size or indicator accessory.
The Eaton Bussmann 170M family includes different configurations. This guide explains what to check in a dimensional drawing and datasheet before ordering.
1. Start with the exact catalog number
Use the full part number from the fuse label, equipment bill of materials or maintenance documentation. Open the manufacturer’s product page for that exact number and locate the current datasheet, dimensional drawing and any relevant accessory information.
Do not use a drawing from a visually similar fuse as a substitute. Product-family images are useful for orientation, but the dimensions and terminal details must come from the exact model documentation.
2. Understand the main dimensions
The most useful dimensions typically include:
- Overall length, height and width of the fuse body
- Terminal thickness and width, where specified
- Center-to-center spacing between connections or mounting holes
- Mounting bolt or thread size
- Clearance and installation envelope
- Any offset, orientation or special mounting requirement
A datasheet may list body dimensions separately from mounting dimensions or connection spacing. Read the drawing notes carefully and confirm which dimension is measured between the terminal centers.
For example, Eaton’s product page for 170M6500 lists model-specific overall dimensions, connection spacing and an M12 mounting dimension. Those values apply to that catalog number only; they must not be transferred to another 170M model without checking its own documentation.
3. Identify the terminal style
High-speed fuse links may use different connection arrangements, including flush-end contacts or bolted-tag configurations. The tags may differ in shape, orientation, slot arrangement and mounting details. These differences affect how the fuse fits into the existing busbar or holder assembly.
When checking terminal style, compare the manufacturer’s drawing with the installed component and equipment documentation. Look for:
- Flush-end versus offset connection geometry
- Blade, slotted or other bolted-tag details
- Terminal hole diameter and mounting bolt size
- Center spacing and terminal orientation
- Required hardware, torque and contact arrangement
- Clearance from adjacent conductive parts
Never modify terminals or mounting hardware to force a fuse into place unless the equipment manufacturer explicitly permits the method and a qualified engineer has approved it.
4. Check indicators and accessories
Some models may include a fuse status indicator or be designed for use with a compatible microswitch. If the installation relies on remote fuse-status monitoring, the replacement must preserve the required indicator and accessory compatibility.
Check the exact catalog number, indicator type and accessory documentation. Similar fuse bodies may be available with different indicator configurations, so appearance alone is not enough.
5. Use the datasheet as a complete verification document
The illustration is a visual guide only. Actual dimensions, terminal arrangements and ratings vary by model. Before ordering, confirm the following information in the current datasheet:
6. Measure safely and avoid common mistakes
If you need to measure an existing fuse, the equipment must be placed in a safe state and isolated according to site procedures. Fuse removal and inspection should be performed by qualified personnel. Do not measure, loosen or remove a fuse from energized equipment.
Common mistakes include measuring only the ceramic body, ignoring connection center spacing, overlooking the indicator suffix, using an outdated drawing or assuming that two fuses with the same mounting holes have equivalent electrical performance.
A physical match is only one part of replacement verification. The electrical ratings and coordination requirements must also match the application.
Frequently asked questions
Are all 170M fuses the same size?
No. The family includes multiple sizes and terminal configurations. Verify the dimensional drawing for the exact catalog number.
Can I use a different terminal style if the ratings match?
Not without confirming that the connection arrangement is permitted by the equipment design and that all mechanical, electrical and compliance requirements are met.
Where can I find the dimensions?
Start with the manufacturer’s product page for the exact catalog number and download the current dimensional drawing or datasheet. Distributor pages can help locate the product, but resolve any discrepancy using the latest manufacturer documentation.
Find the matching 170M model
Browse the FuseStock 170M product collection and open the individual model page. When requesting a quote, provide the complete part number, quantity and any known terminal or mounting requirements. If you are seeking a replacement, include clear photos and the equipment model where available.
Technical note: Dimensional drawings and accessory details are model-specific and may change. Always confirm the current manufacturer datasheet and equipment requirements before purchase or installation.
