Firaka varahina nikela, izay manana fanoherana herinaratra ambany, mahatohitra hafanana tsara ary mahatohitra harafesina, mora ampiasaina
voahodina sy voahodina amin'ny alalan'ny "firaka". Ampiasaina hanaovana ireo singa fototra ao amin'ny "thermal overload relay", izay manana fanoherana ambany.
mpanapaka ny faritra mafana, ary ireo fitaovana elektrika. Akora manan-danja amin'ny tariby fanafanana elektrika ihany koa izy io.
Fampiharana ny tariby varahina nikela:
1. singa fanafanana
2. fanoherana ny fikorianan'ny herinaratra amin'ny relay overload mafana
3. mpanapaka herinaratra ambany voltazy
4. fitaovana ambany voltazy
| Fananana/ Akora | Resistivity (200C μΩ.m) | Mari-pana ambony indrindra (℃) | Tanjaky ny fihenjanana (Mpa) | Teboka fandrendrehana (℃) | TCRx10-6 /℃(20~600℃) | EMF vs Cu(μV/ ℃)(0~100 (℃) | Hakitroky (g/cm3) |
| NC003 (CuNi1) | 0.03 | 200 | 210 | 1085 | <100 | -8 | 8.9 |
| NC005 (CuNi2) | 0.05 | 200 | 220 | 1090 | <120 | -12 | 8.9 |
| NC010 (CuNi6) | 0.1 | 220 | 250 | 1095 | <60 | -18 | 8.9 |
| NC012 (CuNi8) | 0.12 | 250 | 270 | 1097 | <57 | -22 | 8.9 |
| NC015 (CuNi10) | 0.15 | 250 | 290 | 1100 | <50 | -25 | 8.9 |
| NC020 (CuNi14) | 0.2 | 300 | 310 | 1115 | <30 | -28 | 8.9 |
| NC025 (CuNi19) | 0.25 | 300 | 340 | 1135 | <25 | -32 | 8.9 |
| NC030 (CuNi23) | 0.3 | 300 | 350 | 1150 | <16 | -34 | 8.9 |
| NC035 (CuNi30) | 0.35 | 350 | 400 | 1170 | <10 | -37 | 8.9 |
| NC040 (CuNi34) | 0.4 | 350 | 400 | 1180 | 0 | -39 | 8.9 |
| NC050 (CuNi44) | 0.5 | 400 | 420 | 1200 | <-6 | -43 | 8.9 |
150 0000 2421