The Crouse-Hinds series MTL SD range is a series of surge protection devices combining unparalleled packing densities, application versatility, proven reliable hybrid circuitry, simple installation and optional ‘loop disconnect’ facilities – features which make the range the ultimate surge protection solution for process equipment, I/O systems and communications networks.
The exceptionally high packing densities are the consequence of an ultra-slim footprint for individual modules which can thus "double-up" as feedback terminals. Each module provides full hybrid surge protection for 2 and 3 wire loop protection.
SDX models
Available in 7V, 16V, 32V and 55V versions (SD07X, SD16X, SD32X and SD55X respectively) are suitable for a wide range of applications including THCs, 4-20mA loops, shut-down systems and fire and gas detectors.
|  			 Model  |  			 			 Nominal voltage+ (Un) (Vdc) (Vac)  |  			 			 Nominal current (In) (mA)  |  			 			 Series resistance 
 (Ω/line)  |  			 			 Max. leakage current (µA)  |  			 			 Rated voltage *MCOV) (Uc)  |  			 			 Voltage protection level (Up) @1kV/µs (V)  |  			 			 Residual voltage @isn (V)  |  			 			 Bandwidth (frequency) 
 (fG)  |  			 			 Special feature  |  		||
|  			 SD07  |  			 			 7  |  			 			 5  |  			 			 250  |  			 			 4.2†  |  			 			 500  |  			 			 7.7  |  			 			 <12  |  			 			 30  |  			 			 25kHz  |  			 			 Fuse disconnect  |  		|
|  			 SD16  |  			 			 16  |  			 			 11  |  			 			 250  |  			 			 4.2†  |  			 			 5  |  			 			 17  |  			 			 <25  |  			 			 40  |  			 			 25kHz  |  			 			 Fuse disconnect  |  		|
|  			 SD32  |  			 			 32  |  			 			 22  |  			 			 250  |  			 			 4.2†  |  			 			 5  |  			 			 36  |  			 			 <45  |  			 			 60  |  			 			 25kHz  |  			 			 Fuse disconnect  |  		|
|  			 SD55  |  			 			 55  |  			 			 38  |  			 			 250  |  			 			 4.2†  |  			 			 5  |  			 			 62  |  			 			 <90  |  			 			 100  |  			 			 25kHz  |  			 			 Fuse disconnect  |  		|
|  			 SD07R  |  			 			 7  |  			 			 5  |  			 			 400  |  			 			 2.7  |  			 			 500  |  			 			 7.7  |  			 			 <12  |  			 			 30  |  			 			 50MHz  |  			 			 High bandwidth  |  		|
|  			 SD16R  |  			 			 16  |  			 			 11  |  			 			 400  |  			 			 4.7  |  			 			 5  |  			 			 17  |  			 			 <25  |  			 			 40  |  			 			 50MHz  |  			 			 High bandwidth  |  		|
|  			 SD32R  |  			 			 32  |  			 			 22  |  			 			 400  |  			 			 10  |  			 			 5  |  			 			 36  |  			 			 <45  |  			 			 60  |  			 			 50MHz  |  			 			 High bandwidth  |  		|
|  			 SD55R  |  			 			 55  |  			 			 38  |  			 			 400  |  			 			 10  |  			 			 5  |  			 			 62  |  			 			 <90  |  			 			 100  |  			 			 50MHz  |  			 			 High bandwidth  |  		|
|  			 SD07X  |  			 			 7  |  			 			 5  |  			 			 400  |  			 			 2.2  |  			 			 500  |  			 			 7.7  |  			 			 <12  |  			 			 30  |  			 			 25kHz  |  			 			 Low resistance  |  		|
|  			 SD16X  |  			 			 16  |  			 			 11  |  			 			 400  |  			 			 2.2  |  			 			 5  |  			 			 17  |  			 			 <25  |  			 			 40  |  			 			 25kHz  |  			 			 Low resistance  |  		|
|  			 SD32X  |  			 			 32  |  			 			 22  |  			 			 400  |  			 			 2.2  |  			 			 5  |  			 			 36  |  			 			 <45  |  			 			 60  |  			 			 25kHz  |  			 			 Low resistance  |  		|
|  			 SD55X  |  			 			 55  |  			 			 38  |  			 			 400  |  			 			 2.2  |  			 			 5  |  			 			 62  |  			 			 <90  |  			 			 100  |  			 			 25kHz  |  			 			 Low resistance  |  		|
|  			 SD32T3  |  			 			 32  |  			 			 22  |  			 			 400  |  			 			 2.2^  |  			 			 5  |  			 			 36  |  			 			 <45  |  			 			 75  |  			 			 720kHz  |  			 			 3Terminal  |  		|
|  			 SD07R3  |  			 			 7  |  			 			 5  |  			 			 400  |  			 			 2.7  |  			 			 500  |  			 			 7.7  |  			 			 <12  |  			 			 30  |  			 			 50MHz  |  			 			 3Terminal  |  		|
|  			 SD16R3  |  			 			 16  |  			 			 11  |  			 			 400  |  			 			 4.7  |  			 			 5  |  			 			 17  |  			 			 <25  |  			 			 40  |  			 			 50MHz  |  			 			 3Terminal  |  		|
|  			 SD32R3  |  			 			 32  |  			 			 22  |  			 			 400  |  			 			 10  |  			 			 5  |  			 			 36  |  			 			 <45  |  			 			 60  |  			 			 50MHz  |  			 			 3Terminal  |  		|
|  			 SD55R3  |  			 			 55  |  			 			 38  |  			 			 400  |  			 			 10  |  			 			 5  |  			 			 62  |  			 			 <90  |  			 			 100  |  			 			 50MHz  |  			 			 3Terminal  |  		|
|  			 SDRTD  |  			 			 1  |  			 			 0.75  |  			 			 10<  |  			 			 2.7  |  			 			 0.3  |  			 			 5  |  			 			 <12  |  			 			 38  |  			 			 50MHz  |  			 			 3-wire RTD  |  		|
|  			 SDPSTN  |  			 			 162  |  			 			 114  |  			 			 550  |  			 			 4.7  |  			 			 5  |  			 			 175  |  			 			 <200  |  			 			 235  |  			 			 4MHz  |  			 			 PSTN  |  		|
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  |  			 			 ac rms  |  			 			 dc  |  			 			 ac rms  |  			 			 
  |  			 			 
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|  			 SD150X  |  			 			 150  |  			 			 120  |  			 			 3A‡  |  			 			 0.1  |  			 			 50  |  			 			 170  |  			 			 130  |  			 			 <400  |  			 			 450  |  			 			 ——  |  			 			 High current  |  		
|  			 SD275X  |  			 			 320  |  			 			 240  |  			 			 3A‡  |  			 			 0.1  |  			 			 50  |  			 			 360  |  			 			 275  |  			 			 <700  |  			 			 850  |  			 			 ——  |  			 			 High current  |  		
Note: all figures are typical at +25°C unless otherwise stated; *standard fuse; +over full working
temperature range; †at 20mA with a 250mA standard fuse; ‡these units need external 3A fuses; ^Signal;
**Power & Common; <maximum energizing current depends upon RTD resistance. See page 2 for details.
Related Part Number:
|  			 HCU16  |  			 			 MTL5521  |  			 			 MTL4546Y  |  			 			 MTL7761PAC  |  		
|  			 HCU3700  |  			 			 MTL5522  |  			 			 MTL4549Y  |  			 			 MTL7765AC  |  		
|  			 HM64RIB20-1.0  |  			 			 MTL5531  |  			 			 MTL4573  |  			 			 MTL7787+  |  		
|  			 HM64RIB20-1.5  |  			 			 MTL5532  |  			 			 MTL4575  |  			 			 MTL7787P+  |  		
|  			 HMM64  |  			 			 MTL5541  |  			 			 MTL4646Y  |  			 			 MTLCPS16  |  		
|  			 HMRIB16-1.0  |  			 			 MTL5541S  |  			 			 MTL4850  |  			 			 NJ5-18GK-N  |  		
|  			 HMS64  |  			 			 MTL5544  |  			 			 MTL4851  |  			 			 SD150X  |  		
|  			 HTP-SC32  |  			 			 MTL5544D  |  			 			 MTL4852  |  			 			 SD32  |  		
|  			 MTL4044D  |  			 			 MTL5546  |  			 			 MTL5018  |  			 			 SD32X  |  		
|  			 MTL4511  |  			 			 MTL5546Y  |  			 			 MTL5032  |  			 			 SDRTD  |  		
|  			 MTL4516  |  			 			 MTL5561  |  			 			 MTL5042  |  			 			 SLP32D  |  		
|  			 MTL4516C  |  			 			 MTL5573  |  			 			 MTL5044  |  			 			 TP48-3-I-NDI  |  		
|  			 MTL4521  |  			 			 MTL5575  |  			 			 MTL5049  |  			 			 TP48-3-N-NDI  |  		
|  			 MTL4541  |  			 			 MTL5582B  |  			 			 MTL5511  |  			 			 TP48-4-I-NDI  |  		
|  			 PCL45USB  |  			 			 MTL7728+  |  			 			 MTL5514D  |  			 			 TP48-4-N-NDI  |  		
|  			 MTL4544  |  			 			 MTL7756AC  |  			 			 MTL5516  |  			 			 TP48-N-NDI  |  		
|  			 MTL4544D  |  			 			 MTL7760AC  |  			 			 MTL5516C  |  			 			 ZB24571  |  		
