NR8 · NC8 OVERLOAD
NR8 is the thermal-overload family built around NC8 contactor coordination.
The 2026 source lists NR8 for 50/60 Hz circuits to 690 V and family current coverage from 0.1 A to 630 A, with overload and phase-loss protection.
Verified source data
Use the exact NR8 size that contains the motor current and fits the selected NC8 contactor.
| Item | NR8 source data | Selection note |
|---|---|---|
| Voltage | Up to 690 V | Confirm exact model |
| Family current coverage | 0.1–630 A | Not one continuously adjustable device |
| Functions | Overload, phase-loss, temperature compensation, action indication, manual/automatic reset | Coordinate with motor starting duty |
| Contactor family | NC8 | Check exact direct-mount combination |
Do not mix NR2 and NR8 by name alone
The families overlap in current but are tied to different contactor platforms.
Rule: NC1 → NR2; NC8 → NR8 as the primary 2026-source family relationships. Always confirm the exact frame combination.
Source reference
Internal database reference for engineering review.
2026 B11 compilation: NR8 detailed section begins at page 767. B12 overview: page 17.