Eaton Bussmann 170M Fuse Part Number Guide: Sizes, Indicators and Catalog Families
Key Facts
- 170M is a product-family prefix, not a decoding scheme for the whole specification.
- Size 000 690 V AC groups: 170M1308-1322 (no indicator), 170M1358-1372 (visual indicator), 170M1408-1422 (Type T for microswitch).
- Size 000 covers 15 current steps from 10 A to 315 A.
- Lower-current models in the size 000 family are listed as gR; higher-current models as aR.
- Size 00 groups include 170M2608-2621, 170M2658-2671, 170M2708-2721 and 170M2758-2771.
- Flush-end contacts and DIN 43653 bolted tags are listed as separate configurations.
- gR is a full-range semiconductor category; aR is partial-range and relies on the wider protection scheme.
- A fuse can fit the holder and still be electrically unsuitable, so both checks are required.
- Ordering requires the complete catalog number with its suffix, not the family prefix.
The Eaton Bussmann 170M series includes high-speed square-body fuse links used in semiconductor protection, DC drives, power converters and rectifier assemblies. For engineers, maintenance teams and procurement specialists, identifying the correct 170M fuse requires more than matching the first few characters of a catalog number. The complete part number can distinguish body size, terminal arrangement, indicator configuration and electrical characteristics.
This guide organizes selected 170M catalog families into practical search groups. It is a catalog-discovery aid—not a universal replacement chart. Always verify the complete catalog number against the current manufacturer datasheet and the equipment maker’s approved parts list.
1. Start with the complete catalog number
When searching for a replacement, record every character printed on the fuse label, including suffixes. A shortened number may return a related product with a different indicator or mounting interface. If the label is unreadable, use the equipment bill of materials, the original purchase record or the dimensional drawing to establish the exact model.
Eaton’s product records distinguish multiple 170M configurations within the same broad current range. The catalog number should therefore be treated as a unique product identifier, not as a code from which every rating can be safely inferred.
2. Selected 690 V AC size 000 families
The Eaton IEC high-speed fuse catalogue lists size 000 square-body families for 690 V AC applications. Common catalog groups include:
| Catalog-number group | General configuration described in the catalogue | Verification focus |
|---|---|---|
| 170M1308–170M1322 | DIN 43653 / U/80 family without an indicator | Confirm current rating, gR/aR category and terminals |
| 170M1358–170M1372 | Related visual-indicator family | Confirm indicator position and holder clearance |
| 170M1408–170M1422 | Related Type T indicator family for microswitch use | Confirm microswitch and accessory compatibility |
The listed size 000 family covers current steps from 10 A to 315 A, but not every current step has the same utilization category. Eaton’s catalogue identifies gR for the lower-current portion of the family and aR for higher-current models. Check the exact model rather than assuming a category from the family name.
3. Selected size 00 families
The broader 170M catalogue also includes size 00 families, with catalog-number groups such as:
- 170M2608–170M2621
- 170M2658–170M2671
- 170M2708–170M2721
- 170M2758–170M2771
These groups represent different catalog configurations within the size 00 range. Their mechanical interfaces and indicator arrangements may differ. For example, the Eaton catalogue lists flush-end contact variants separately from DIN 43653 bolted-tag families. Do not infer terminal type from the numerical sequence alone.
4. What to verify before ordering
Use this checklist to create a technically useful RFQ:
- Complete 170M catalog number and suffix
- Rated voltage and whether the circuit is AC or DC
- Rated current and operating conditions
- Utilization category and intended protection role
- Interrupting rating at the applicable circuit conditions
- Pre-arcing and total-clearing I²t where semiconductor coordination requires it
- Terminal type, body size, mounting dimensions and clearances
- Visual indicator, microswitch or remote status-monitoring requirements
- Equipment model, approved part number and quantity
A fuse may fit the holder yet be electrically unsuitable. Conversely, a fuse with a matching current rating may not fit the existing busbar or monitoring arrangement.
5. gR and aR are not interchangeable labels
The utilization category is part of the selection decision. In broad terms, gR is a full-range semiconductor fuse category, whereas aR is intended for partial-range semiconductor protection and normally depends on the wider protection scheme to address lower overcurrents. The applicable standard, equipment design and manufacturer’s application data determine which category is appropriate.
Do not replace a gR fuse with an aR fuse—or the reverse—solely because the ampere rating appears similar. Any alternative requires a documented technical review.
6. Common sourcing mistakes
- Searching only for “170M fuse” instead of the complete catalog number
- Omitting a suffix that identifies an indicator or construction variant
- Assuming every 170M size 000 or size 00 fuse has the same voltage rating
- Treating bolted-tag, blade-end and flush-end connections as equivalent
- Assuming a listed product is currently in stock
- Using a similar model number as proof of interchangeability
Related 170M guides
Browse all 170M high-speed fuses
Filter the full FuseStock 170M range by current, voltage and body size.
Size 000 and size 00 170M models
Current steps, catalog groups and indicator variants for the smallest 690 V bodies.
170M catalog cross-reference: 170M3008–170M6771
Selected size 1 to size 3 families plus a verification workflow for replacements.
Size 1 170M fuses: 170M4138–170M4146
The size 1 model map and why the 630 A model is not a voltage reference.
Manufacturer references
Technical note: Confirm the current Eaton datasheet and equipment manufacturer’s approved replacement procedure before purchasing or installing a fuse.
Frequently Asked Questions
Does the 170M prefix identify a complete fuse specification?
No. It identifies the product family. Body size, rated voltage, current, utilization category, terminal style and indicator configuration all need the complete catalog number.
Is every 690 V AC 170M size 000 fuse rated the same way?
No. The 10-315 A ladder is split across gR and aR models, and the indicator configuration differs between the 1308, 1358 and 1408 groups.
Can a gR fuse be replaced by an aR fuse of the same current rating?
No. gR covers full-range semiconductor protection while aR is partial-range and depends on other devices for lower overcurrents. Any swap needs a documented technical review.
What is the difference between 170M1308, 170M1358 and 170M1408?
They represent the same 10 A current step in three configurations: no indicator, visual indicator, and Type T indicator for microswitch use.
Do all models in one catalog group share the same I2t values?
No. I2t is published per catalog number and per voltage condition. Values must not be carried across neighbouring numbers.
Where can the 170M range be searched by catalog number?
The FuseStock 170M collection at fusestock.com/product-tag/170m/ can be searched with the complete catalog number.