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Basis: 3-phase 400V, cosφ≈0.85, η≈0.87. Contactor sized to AC-3 Ie ≥ FLC×1.25; NXR thermal setpoint = 0.95–1.05 × nameplate FLC. Always verify against the motor nameplate; upsize one frame for frequent starts (>30/hr) or high ambient (>40°C).
|
Motor kW |
Motor HP* |
Est. FLC @400V (A) |
AC-3 Ie needed (A) |
Recommended NXC |
NXC AC-3 Ie (A) |
Recommended NXR |
NXR range (A) |
NXR setpoint (A) |
Upstream MCB (C, A) |
Typical use |
|---|---|---|---|---|---|---|---|---|---|---|
|
0.37 |
0.5 |
0.8 |
1.0 |
NXC-09 |
9 |
NXR-25 |
0.4–22 |
0.7–0.8 |
6 |
Small pump / fan |
|
0.55 |
0.75 |
1.1 |
1.4 |
NXC-09 |
9 |
NXR-25 |
0.4–22 |
1.0–1.1 |
6 |
Small pump / fan |
|
0.75 |
1.0 |
1.5 |
1.9 |
NXC-09 |
9 |
NXR-25 |
0.4–22 |
1.4–1.5 |
6 |
Small pump / fan |
|
1.1 |
1.5 |
2.1 |
2.7 |
NXC-09 |
9 |
NXR-25 |
0.4–22 |
2.0–2.3 |
6 |
Conveyor / compressor |
|
1.5 |
2.0 |
2.9 |
3.6 |
NXC-09 |
9 |
NXR-25 |
0.4–22 |
2.8–3.1 |
6 |
Conveyor / compressor |
|
2.2 |
3.0 |
4.3 |
5.4 |
NXC-09 |
9 |
NXR-25 |
0.4–22 |
4.1–4.5 |
10 |
Workshop pump |
|
3.0 |
4.0 |
5.8 |
7.3 |
NXC-09 |
9 |
NXR-25 |
0.4–22 |
5.6–6.1 |
10 |
Workshop pump |
|
4.0 |
5.4 |
7.8 |
9.7 |
NXC-12 |
12 |
NXR-25 |
0.4–22 |
7.4–8.2 |
16 |
Machine tool / cooler |
|
5.5 |
7.4 |
10.7 |
13.4 |
NXC-18 |
18 |
NXR-25 |
0.4–22 |
10.2–11.3 |
20 |
Compressor |
|
7.5 |
10.1 |
14.6 |
18.3 |
NXC-25 |
25 |
NXR-25 |
0.4–22 |
13.9–15.4 |
25 |
Large pump / fan |
|
11 |
14.7 |
21.4 |
26.8 |
NXC-32 |
32 |
NXR-25 |
0.4–22 |
20.4–22.5 |
32 |
Industrial pump |
|
15 |
20.1 |
29.2 |
36.5 |
NXC-38 |
38 |
NXR-38 |
15–34 |
27.8–30.7 |
40 |
Large fan / compressor |
|
18.5 |
24.8 |
36.0 |
45.0 |
NXC-50 |
50 |
NXR-100 |
30–90 |
34.3–37.9 |
50 |
Air compressor |
|
22 |
29.5 |
42.9 |
53.6 |
NXC-65 |
65 |
NXR-100 |
30–90 |
40.8–45.1 |
63 |
Heavy conveyor |
|
30 |
40.2 |
58.4 |
73.0 |
NXC-80 |
80 |
NXR-100 |
30–90 |
55.6–61.5 |
80 |
Large pump group |
|
37 |
49.6 |
72.0 |
90.0 |
NXC-95 |
95 |
NXR-100 |
30–90 |
68.6–75.8 |
100 |
Mixer / agitator |
|
45 |
60.3 |
87.6 |
109.5 |
NXC-95+ |
95 |
NXR-100 |
30–90 |
83.4–92.2 |
125 |
Big pump / stirrer |
Typical Starter Kit bundles
-
≤4 kW small motors: NXC-09 + NXR-25 + 6–10A C-curve MCB → pumps, fans, small conveyors
-
5.5–11 kW common range: NXC-18 / NXC-25 / NXC-32 + NXR-25 → compressors, machine-tool coolers
-
15–22 kW mid range: NXC-38 / NXC-50 + NXR-38 / NXR-100 → large fans, air compressors
-
30–45 kW heavy duty: NXC-80 / NXC-95 + NXR-100 → large pump groups, agitators
Shop links
-
CHINT NXC contactors (NXC-09/12/18/25/32, AC 24–380V coil):
-
CHINT Kunlun NXR thermal overload relays (0.4–100A, NXR-25/38/100):
⚠️ Notes: *HP = kW×1.34 (approx.); size from kW/FLC, not HP. NXR-25 max setting ~22A, so 11kW still fits; 15kW+ moves to NXR-38/NXR-100. NXR side-couples to NXC via bracket — no extra wiring for the trip contact. For >45kW consider NXC-115/150, soft starter or VFD, and verify IEC Type 2 coordination.