SP Type

APPLICATIONS

Power supply circuits
Dummy loads
Circuits for protecting against parasitic oscillation
PT protection
High-frequency circuits
Accelerators
Other high-current circuits
Ultrasonic devices
Other applications: far-infrared heaters, microwave absorbers

CHARACTERISTICS

Items	Characteristic Value
Normal operating temperature	300℃
Maximum Operating Temperature	350℃
Temperature Coefficient	±0.15%/℃
Withstand Voltage (1.2 / 50µs)	0.5kV/cm
Rate of change of resistance when current is applied (rated time of 500 h)	±10%
Short-time overloading (10 times × 5 sec)	±2%（MAX）
Short-time injection capacity	70J/cm³
Bulk specific gravity	2.0- 2.4
Specific Heat	630J/（kg⋅K）
Thermal expansion coefficient	3- 5×10^-6（/℃）

SP STANDARD SPECIFICATIONS:

Model	Rated Power (W)	Dimension(mm)				Cross Sections (cm²)	Effective length(cm)	Volume (cm³)	Resistance Value Range (Ω)	Maximum Operating Impulse Voltage (kV) *1 1.2/50µs	Allowable Energy Injected (J)	Unit Weight (g)
Model	Rated Power (W)	φD	φd	L	L1	Cross Sections (cm²)	Effective length(cm)	Volume (cm³)	Resistance Value Range (Ω)	Maximum Operating Impulse Voltage (kV) *1 1.2/50µs	Allowable Energy Injected (J)	Unit Weight (g)
ER3SP	3	4.5±1.0	–	20±1	38±2	0.13	1.4	0.18	1.0- 390	0.5	11	0.5
ER5SP	5	8.5±1.0	–	25±1	38±2	0.50	1.8	0.90	1.0- 150	0.5	63	3
ER10SP	10	8.5±1.0	–	40±1	38±2	0.50	3.3	2.01	1.0- 270	1	110	4
ER20SP	20	14±0.5	8	60±1	10±2	1.04	4	6.22	0.33- 220	2	290	14
ER30SP	30	14±0.5	8	80±1	10±2	1.04	6	7.67	0.47- 230	3	430	19
ER50SP	50	20±0.8	14	100±1	13±2	1.60	7.4	11.9	0.47- 270	4	830	36
ER100SP	100	20±0.8	14	200±2	15±2	1.60	17	27.2	1.0- 680	8.5	1900	72
ER150SP	150	25±1.0	18	250±2	22±2	2.36	20.6	48.7	0.82- 520	10	3400	133
ER200SP	200	25±1.0	18	300±2	22±2	2.36	20.6	60.5	1.0- 680	12.5	4240	160
ER300SP	300	40±1.3	32	300±2	22±2	4.52	25.6	116	0.56- 330	12.5	8100	305
ER500SP	500	50±1.5	40	450±2	25±2	7.07	40	283	0.56- 330	20	19800	716

ER3SP through ER10SP will be supplied with lead wires.
ER20SP through ER500SP will be supplied with terminals as option, if so requested with an order. (The details on the terminals are shown at page 12).

SPT STANDARD SPECIFICATIONS (Vertical Mounting Type):

Model	Rated Power （W）	Dimensions (mm)								Maximum Operating Impulse Voltage (kV) *1 1.2/50µs
Model	Rated Power （W）	φB	L	L1	D	φC	φS	M	E	Maximum Operating Impulse Voltage (kV) *1 1.2/50µs
ER20SPT	20	14	60	9	70	16	3.2	31	10	2
ER30SPT	30	14	80	9	90	16	3.2	31	10	3
ER50SPT	50	20	100	12	110	22	4.2	42	10	4

SPY STANDARD SPECIFICATIONS (Horizontal Mounting Type):

Model	Rated Power (W)	Dimensions (mm)											Maximum Operating Impulse Voltage (kV) *1 1.2/50µs
Model	Rated Power (W)	φB	L	L1	φS	C	E	D	F	F0	M	t	Maximum Operating Impulse Voltage (kV) *1 1.2/50µs
ER20SPY	20	14	60	9	3.2	70	103	90	16	4.2	16	0.8	2
ER30SPY	30	14	80	9	3.2	90	123	110	16	4.2	16	0.8	3
ER50SPY	50	20	100	12	4.2	110	143	130	16	4.2	16	0.8	46
ER100SPY	100	20	200	12	4.2	210	243	230	16	4.2	16	0.8	6
ER150SPY	150	25	250	21	5.2	262	315	300	26	6	26	1.0	6
ER200SPY	200	25	300	21	5.2	312	365	350	26	6	26	1.0	6
ER300SPY	300	40	300	21	5.2	320	380	360	40	10	40	1.5	6

Notes on Using the SP Resistors

The SP resistors are susceptible to surge voltage. We recommend using them at about 50% (0.25 kV/cm) of the maximum operating impulse voltage.
The SP resistors can be used in oil or water as are. For water-cooled applications, we will attach a brass electrode.
Use pure water with a resistivity of 1 MΩ•cm or higher (an electrical conductivity of 1 µS/cm or lower) as the cooling water.
The dielectric strength decreases at a high surface temperature greater than or equal to 300℃.
Install SPY or SPT resistors in a vibration-free location.
The SPY and SPT resistors include insulators. Overtightening the screws can cause breakage. We recommend that the tightening torque be 0.3 N•m for M3 screws, and 0.4 N•m for M4 screws.