Elmwood RD Series

Elmwood Thermal Cut Offs is available for variety of package options.

RD series consist of thermal fuse mounted in an insulating high temperature ceramic base.

The electrical resistance of a RD Series thermal Cut Offs is comparable to that found in an equal length of 18 gauge solid copper wire. With proper air flow, heat generation below 15 Amperes in minimal. Above 15 Amperes, the upper limit on current capacity will depend on the environment for each specific application,

RD SERIES TEMPERATURE RATING

MODEL Tf (FUNCTIONING OPEN TEMPERATURE) Th (HOLDING TEMPERATURE) Tm (MAXIMUM OVERSHOOT TEMPERATURE) SAFETY APPROVAL
RD070 72 162 +0/-4℃ 57 115 UL, C-UL
RD076 77 171 +0/-4℃ 62 150
RD081 84 183 +0/-4℃ 69 115
RD088 90 194 +0/-4℃ 75 150
RD090 93 199 +0/-6℃ 78 315
RD098 100 212 +0/-4℃ 85 130
RD103 104 219 +0/-4℃ 89 315
RD108 109 228 +0/-4℃ 94 315
RD115 117 243 +0/-4℃ 102 130
RD118 121 250 +0/-6℃ 106 315
RD125 128 262 +0/-4℃ 113 180
RD139 141 286 +0/-6℃ 126 230
RD165 169 336 +0/-6℃ 154 210(250V)  270(120V)
RD181 184 363 +0/-4℃ 169 210
RD213 216 421 +0/-4℃ 201 375
RD226 228 442 +0/-6℃ 212 260(120V)240(250V)
RD242 240 464 +0/-6℃ 215 375

 

Tf (FUNCTIONING OPEN TEMPERATURE)
The maximum temperature at which the thermal cut offs changes its state of conductivity
to open circuit with detection current as the only load.

Th (HOLDING TEMPERATURE)
The maximum temperature at which,when applying no electrical load to the thermal cut offs,
the state of conductivity will not change during a period of 168 hours.

Tm (MAXIMUM OVERSHOOT TEMPERATURE)
The maximum temperature of thermal cut offs, having changed its state of conductivity, can be maintained for 10 minutes
during which its mechanical and electrical properties will not be impaired.

ELECTRICAL RATINGS

SAFETY APPROVAL VOLTAGE (AC) RESISTIVE CURRENT
(Vr) (Ir) (Ib)
UL, C-UL 120V / 240V 16.7A 25A
120V for only RD139 16.7A 25A


<Notes> All products shall comply with IEC-60691 - FOR ED. 3.0 AMENDMENT 2.