690 V AC Eaton Bussmann 170M Fuse Models: Size 000 and Size 00 Guide
Key Facts
- Size 000 current ladder: 10, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125, 160, 200, 250 and 315 A.
- At 10 A the three variants are 170M1308, 170M1358 and 170M1408; at 315 A they are 170M1322, 170M1372 and 170M1422.
- The 1308 group has no indicator, the 1358 group a visual indicator, the 1408 group a Type T indicator.
- Size 00 groups include 170M2608-2621, 170M2658-2671, 170M2708-2721 and 170M2758-2771.
- gR is identified for the lower-current portion of the size 000 family and aR for higher-current models.
- Type T indicator models are intended for microswitch-based status monitoring.
- Indicator position and holder clearance change with the variant and must be checked.
- Size 00 includes both flush-end contacts and DIN 43653 bolted-tag constructions.
The Eaton Bussmann 170M size 000 and size 00 families include high-speed square-body fuse links used in semiconductor protection, DC common-bus systems, drives and power converters. The catalogue distinguishes fuse size, current rating, terminal construction and indicator configuration. These details should be treated as a single specification rather than separate shopping filters.
This guide summarizes selected 690 V AC catalog groups and shows how to verify the exact model before ordering. The tables are for model discovery; they are not a substitute for the current datasheet or the equipment manufacturer’s approved parts list.
1. Size 000: selected catalog groups
Eaton’s catalogue lists a size 000 family with current steps from 10 A to 315 A. Three common groups are:
| Catalog-number range | Configuration described in the catalogue | Important check |
|---|---|---|
| 170M1308–170M1322 | U/80 family without indicator | Confirm model-specific current and utilization category |
| 170M1358–170M1372 | Related visual-indicator family | Confirm indicator and mounting clearance |
| 170M1408–170M1422 | Type T indicator family for microswitch use | Confirm switch compatibility and accessories |
The family includes both gR and aR utilization categories, depending on the current rating. For example, Eaton lists 170M1308 as a 10 A, 690 V IEC gR fuse with a non-indicating configuration. Higher-current models in the family may have different utilization categories and characteristics.
2. Current-step reference for the 170M1308–170M1422 group
The catalogue maps the current steps across the corresponding configuration groups:
| Rated current | Without indicator | Visual indicator | Type T indicator |
|---|---|---|---|
| 10 A | 170M1308 | 170M1358 | 170M1408 |
| 16 A | 170M1309 | 170M1359 | 170M1409 |
| 20 A | 170M1310 | 170M1360 | 170M1410 |
| 25 A | 170M1311 | 170M1361 | 170M1411 |
| 32 A | 170M1312 | 170M1362 | 170M1412 |
| 40 A | 170M1313 | 170M1363 | 170M1413 |
| 50 A | 170M1314 | 170M1364 | 170M1414 |
| 63 A | 170M1315 | 170M1365 | 170M1415 |
| 80 A | 170M1316 | 170M1366 | 170M1416 |
| 100 A | 170M1317 | 170M1367 | 170M1417 |
| 125 A | 170M1318 | 170M1368 | 170M1418 |
| 160 A | 170M1319 | 170M1369 | 170M1419 |
| 200 A | 170M1320 | 170M1370 | 170M1420 |
| 250 A | 170M1321 | 170M1371 | 170M1421 |
| 315 A | 170M1322 | 170M1372 | 170M1422 |
The table follows the catalogue’s current-step mapping. Confirm the exact model’s current record, voltage type, utilization category and construction before using it for a quotation or replacement.
3. Size 00: selected model families
Selected size 00 groups in the broader 170M catalogue include:
- 170M2608–170M2621
- 170M2658–170M2671
- 170M2708–170M2721
- 170M2758–170M2771
The exact configuration varies by family. Some groups use DIN 43653 bolted-tag connections, while other catalogue tables describe flush-end contact variants. The indicator arrangement may also differ. As a result, a size 00 fuse should not be selected by the body-size label alone.
4. Ratings, utilization category and fault performance
For every candidate, verify:
- Rated voltage and whether the application is AC or DC
- Rated current and expected load/thermal conditions
- gR or aR utilization category
- Interrupting rating versus prospective fault current
- Pre-arcing and total-clearing I²t under applicable test conditions
- Terminal type and mounting dimensions
- Visual indicator, Type T indicator or microswitch requirements
- The equipment manufacturer’s approved model or replacement criteria
An interrupting rating is meaningful only in the context of the specified circuit voltage and test conditions. Likewise, I²t values should not be compared across models without confirming that the measurement conditions are compatible.
5. Why indicator variants deserve attention
A visual indicator can support maintenance inspection, while a microswitch-compatible configuration can feed a remote fuse-status signal into the equipment control system. Those options affect the installed interface. Confirm the indicator and accessory requirements before selecting a model from a related catalog group.
Do not assume the suffix or nearby catalog number guarantees the indicator style. Use the exact manufacturer product page and drawing.
Related 170M guides
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170M part number guide: sizes and indicator variants
How the complete catalog number encodes body size, terminal type and indicator configuration.
Compact flush-end 170M fuses: 170M3468 and 170M3473
Flush-end geometry, Type K indicators and microswitch integration.
Size 3 flush-end 170M fuses: 170M6408–170M6571
Current ladder, connection spacing and indicator selection for 690 V size 3.
Find 690 V AC 170M models on FuseStock
Use the FuseStock 170M collection to search the complete catalog number. Include the application, quantity and indicator requirements when requesting a quote.
Manufacturer references
Technical note: Verify the current datasheet for the exact model and follow the equipment manufacturer’s replacement instructions.
Frequently Asked Questions
How many catalog variants exist for each 690 V AC size 000 current step?
Three: a no-indicator model, a visual-indicator model and a Type T microswitch model, for example 170M1317, 170M1367 and 170M1417 at 100 A.
Is the utilization category the same across the 10-315 A ladder?
No. Eaton's catalogue identifies gR for the lower-current portion and aR for higher-current models, so the exact number has to be checked.
What is a Type T indicator used for?
It allows a microswitch to report fuse operation to the control system, which is why the compatible switch and clearance must be confirmed.
Do the size 00 groups have the same terminal arrangement?
No. Flush-end and DIN 43653 bolted-tag versions are listed separately, so terminal type cannot be inferred from the catalog number sequence.
Can I substitute a visual-indicator model for a microswitch model?
Only with an engineering review. The equipment may rely on the status signal, so removing it changes the monitoring function.