RTI Electronics
RTI Surge-Gards Thermistors
Inrush Current Limiters
![]() RTI Electronics manufactures SURGE-GUARD™ Inrush current limiting devices (thermistors) using specially formulated metal oxide ceramic materials. These devices are capable of suppressing high inrush current surges. They are especially useful in power supplies where the low impedance of the charging capacitor exposes the diode bridge rectifier to an excessively high current surge at turn-on. NTC Thermistors Negative Temperature Coefficient (NTC) thermistors are thermally sensitive semiconductor resistors which exhibit a decrease in resistance as absolute temperature increases. Change in the resistance of the NTC thermistor can be brought about either by a change in the ambient temperature or internally by self-heating resulting from current flowing through the device. Most of the practical applications of NTC thermistors are based on these material characteristics. IBS Electronics is an authorized distributor for RTI Surge-Gards. |
Part Number | Max. D | Max. T | Lead Dia. | Surge | |||
(Inches) | (Inches) | (Inches) | Rating | Description | |||
Style A | Style B | Style C | (Joules) | ||||
SG260 | SG326 | 1.25 | 0.2 | 0.04 | 31* | Thermistor 0.5 Ohms Tolerance: Tolerance (AMPS) Amps | |
SG415 | SG327 | 0.77 | 0.2 | 0.04 | 45 | Thermistor 0.7 Ohms Tolerance: (±%) Amps | |
SG100 | SG301 | 0.9 | 0.3 | 0.04 | 48* | Thermistor 1 Ohms Tolerance: 20 30 Amps | |
SG405 | SG328 | 1.25 | 0.25 | 0.04 | 157 | Thermistor 1 Ohms Tolerance: 25 12 Amps | |
SG416 | SG329 | 0.55 | 0.2 | 0.04 | 40 | Thermistor 1.3 Ohms Tolerance: 15 20 Amps | |
SG110 | SG302 | 0.9 | 0.35 | 0.04 | 80 | Thermistor 2 Ohms Tolerance: 25 30 Amps | |
SG420 | SG355 | 1.25 | 0.3 | 0.04 | 250 | Thermistor 2 Ohms Tolerance: 25 8 Amps | |
SG120 | SG303 | 0.6 | 0.25 | 0.032 | 27 | Thermistor 2.5 Ohms Tolerance: 15 18 Amps | |
SG130 | SG304 | 0.6 | 0.25 | 0.032 | 27 | Thermistor 2.5 Ohms Tolerance: 25 23 Amps | |
SG140 | SG305 | 0.6 | 0.25 | 0.032 | 27 | Thermistor 2.5 Ohms Tolerance: 15 3 Amps | |
SG150 | SG306 | 0.9 | 0.3 | 0.04 | 87 | Thermistor 2.5 Ohms Tolerance: 15 7 Amps | |
SG160 | SG307 | 0.9 | 0.3 | 0.04 | 87 | Thermistor 2.5 Ohms Tolerance: 15 9 Amps | |
SG170 | SG308 | 0.6 | 0.25 | 0.04 | 27 | Thermistor 4 Ohms Tolerance: 15 10 Amps | |
SG32 | SG330 | 0.9 | 0.35 | 0.04 | 100 | Thermistor 4 Ohms Tolerance: 15 15 Amps | |
SG180 | SG309 | 0.6 | 0.25 | 0.032 | 36 | Thermistor 5 Ohms Tolerance: 15 8 Amps | |
SG413 | 0.53 | 0.2 | 0.025 | 23 | Thermistor 5 Ohms Tolerance: 20 14 Amps | ||
SG190 | SG310 | 0.6 | 0.25 | 0.032 | 36 | Thermistor 5 Ohms Tolerance: 15 2 Amps | |
SG450 | SG373 | 0.6 | 0.25 | 0.032 | 30 | Thermistor 5 Ohms Tolerance: 25 2.8 Amps | |
SG200 | SG311 | 0.6 | 0.25 | 0.032 | 40 | Thermistor 5 Ohms Tolerance: 15 4 Amps | |
SG44 | SG332 | 0.6 | 0.25 | 0.04 | 40 | Thermistor 5 Ohms Tolerance: 15 6 Amps | |
SG26 | SG333 | 0.9 | 0.275 | 0.04 | 100 | Thermistor 5 Ohms Tolerance: 15 7 Amps | |
SG418 | SG334 | 0.6 | 0.27 | 0.032 | 40 | Thermistor 6 Ohms Tolerance: 20 8 Amps | |
SG210 | SG312 | 0.6 | 0.3 | 0.04 | 50 | Thermistor 7 Ohms Tolerance: 15 12 Amps | |
SG85 | SG335 | 0.6 | 0.3 | 0.04 | 45 | Thermistor 7 Ohms Tolerance: 15 5 Amps | |
SG64 | SG336 | 0.95 | 0.275 | 0.04 | 100 | Thermistor 7 Ohms Tolerance: 15 4 Amps | |
SG13 | SG337 | 0.5 | 0.25 | 0.032 | 17 | Thermistor 10 Ohms Tolerance: 25 5 Amps | |
SG220 | SG313 | 0.45 | 0.3 | 0.032 | 17 | Thermistor 10 Ohms Tolerance: 15 10 Amps | |
SG42 | SG338 | 0.6 | 0.35 | 0.04 | 44 | Thermistor 10 Ohms Tolerance: 15 2 Amps | |
SG27 | SG314 | 0.5 | 0.35 | 0.04 | 40 | Thermistor 10 Ohms Tolerance: 15 3 Amps | |
SG40 | SG72 | 0.9 | 0.35 | 0.04 | 50 | Thermistor 10 Ohms Tolerance: 15 5 Amps | |
SG451 | SG374 | 0.5 | 0.35 | 0.04 | 40 | Thermistor 12 Ohms Tolerance: 15 6 Amps | |
SG452 | SG375 | 0.55 | 0.3 | 0.032 | 40 | Thermistor 15 Ohms Tolerance: 20 8 Amps | |
SG86 | 0.53 | 0.3 | 0.025 | 45 | Thermistor 16 Ohms Tolerance: 15 4 Amps | ||
SG414 | 0.53 | 0.3 | 0.025 | 45 | Thermistor 16 Ohms Tolerance: 15 2.5 Amps | ||
SG63 | SG320 | 0.75 | 0.25 | 0.04 | 50 | Thermistor 16 Ohms Tolerance: 25 1.7 Amps | |
SG230 | SG315 | 0.5 | 0.3 | 0.032 | 31 | Thermistor 20 Ohms Tolerance: 25 2.7 Amps | |
SG411 | SG341 | 0.5 | 0.3 | 0.032 | 30 | Thermistor 25 Ohms Tolerance: 25 4 Amps | |
SG412 | SG342 | 0.5 | 0.3 | 0.032 | 30 | Thermistor 25 Ohms Tolerance: 15 1.75 Amps | |
SG38 | SG343 | 0.6 | 0.25 | 0.04 | 25 | Thermistor 30 Ohms Tolerance: 25 1.7 Amps | |
SG240 | SG316 | 0.625 | 0.25 | 0.032 | 20 | Thermistor 40 Ohms Tolerance: 25 2.4 Amps | |
SG52 | SG344 | 0.77 | 0.24 | 0.04 | 55 | Thermistor 47 Ohms Tolerance: 15 3 Amps | |
SG453 | SG376 | 0.6 | 0.25 | 0.032 | 50 | Thermistor 60 Ohms Tolerance: 15 2 Amps | |
SG250 | SG317 | 0.925 | 0.25 | 0.04 | 36 | Thermistor 120 Ohms Tolerance: 25 3 Amps | |
SG31 | SG346 | 0.6 | 0.3 | 0.04 | 25 | Thermistor 220 Ohms Tolerance: 15 1.5 Amps |