| Newark | 51K9864 | 5 | | 5 | 1 @ $6.13, 10 @ $5.75, 25 @ $5.03, 50 @ $4.43, 100 @ $4.23, 250 @ $4.03, 500 @ $3.73, 1000 @ $3.58 |
 Newark | 34P2527 | 1 | 78 | 1 | 1 @ $0.25, 10 @ $0.25, 25 @ $0.25, 50 @ $0.25, 100 @ $0.25, 250 @ $0.25, 500 @ $0.25, 1000 @ $0.25 |
 Walker Industrial | S501-2-5-R | 5 | 3 to 5 Days | 5 | 1 @ $2.19 |
 simsupply.com | ZO-G1431114 | 1 | 22 | 1 | 1 @ $26.39 |
 Galco | BK/S501-2.5-R-BUSS | 100 | | 100 | 1 @ $3.20 |
| Graybar | 25142694 | 5 | | 5 | 1 @ $4.96 |
| Grainger | 1VXR7 | 1 | | 1 | |
 Raptor Supplies | AB3XVE | 1 | | 1 | 1 @ $40.82 |
 Platt.com | 0966667 | 1 | 5 | 1 | 1 @ $5.23 |
| Waldom | EATON ELECTRONICS S501-2.5-R | 1 | | 1 | |
| Waldom | EATON ELECTRONICS BK/S501-2.5-R | 1 | | 1 | |
| crescentelectric.com | 128037 | 1 | | 1 | 1 @ $5.04 |
 Zoro | G1431114 | 1 | 50 | 1 | 1 @ $15.00 |
| specialtycontrolsystems.com | S501-2.5-R | 1 | | 1 | 1 @ $1.87 |
| Dale-Electric | S501-2.5-R | 1 | | 1 | 1 @ $2.40 |
 Platt.com | 0957274 | 1 | | 1 | 1 @ $6.42 |
 grainger.ca | WWG1VXR7 | 1 | | 1 | 1 @ $29.21 |
| Crescent Electric Supply Co | 2154060 | 1 | | 1 | |
| us.rs-online.com | 71930803 | 100 | | 100 | 100 @ $11.88, 200 @ $11.71, 500 @ $11.67, 1000 @ $11.64 |
| us.rs-online.com | 70150745 | 5 | | 5 | 5 @ $4.74 |
| 1Source | BK/S501-2.5-R | 1 | | 1 | |
| RS Online | 5371054 | 1 | | 1 | |
| RS Online | 1699393 | 1 | | 1 | |
| Allied Electronics | 70150745 | 1 | | 1 | |
| RS Delivers | 537-1054 | 1 | 570 | 1 | 1 @ $0.38 |
| Allied Electronics | 71930803 | 100 | | 100 | |
 turtle.com | BUS BK/S501-2.5-R | 1 | -2 | 1 | 1 @ $359.11 |
| Waldom | EATON S501-2.5-R | 1 | | 1 | 1 @ $2.92, 2 @ $2.78, 3 @ $2.72, 5 @ $2.62 |
| Waldom | EATON BK/S501-2.5-R | 1 | | 1 | 1 @ $2.46, 25 @ $2.34, 50 @ $2.29, 100 @ $2.22, 1000 @ $0.66 |
| sustainablesupply.com | C1168253 | 1 | -2 | 1 | 1 @ $24.95 |
 Arrow | BK/S501-2.5-R | 1 | 100 | 1 | 1 @ $2.91, 10 @ $2.65, 100 @ $2.33, 1000 @ $2.33, 10000 @ $2.33 |
| Onlinecomponents.com | S501-2.5-R | 10 | 468 | 1 | 10 @ $2.88, 100 @ $2.47, 1000 @ $0.67, 10000 @ $0.67 |
 Digi-Key | 283-2662-ND | 1 | 173 | 1 | 1 @ $1.47, 5 @ $1.43, 10 @ $1.34, 50 @ $1.11, 100 @ $0.92, 250 @ $0.90, 500 @ $0.76, 1000 @ $0.67, 5000 @ $0.60 |
 Radwell | BKS50125R | 100 | | 100 | 1 @ $2.93 |
 AI Consolidated | S501-2-5-R-BUSSMANN | 1 | -2 | 1 | 1 @ $2.38 |
 AmazonTP | B07CDW163G | 1 | | 1 | 1 @ $5.94 |
 AmazonTP | B003ATP1CA | 1 | | 1 | 1 @ $6.56 |
| Digi-Key | S501-2.5-R-ND | 5 | | 5 | 5 @ $4.73 |
| i-components | S501-2.5-R | 5 | 16457 | 5 | 5 @ $1.84 |
| Hotenda | H574792 | 1 | | 1 | 1 @ $1.44, 5 @ $1.40, 10 @ $1.30, 50 @ $1.08, 100 @ $0.90, 250 @ $0.88, 500 @ $0.74 |
 Onlinecomponents.com | BK/S501-2.5-R | 1 | 500 | 1 | 1 @ $2.19, 25 @ $2.08, 100 @ $1.97, 500 @ $0.83, 1000 @ $0.62 |