Sensors 24 vac/dc Relay coil voltage
We have 9,000+ sensor models in our stock for your next building automation project. Duct, pipe, indoor and outdoor sensors: Blackhawk Supply has it all! Shop today!
![Image for Pressure Sensors](http://blackhawksupply.com/cdn/shop/collections/DLP_1_100x.png?v=1525965948)
![Image for Duct Temperature Sensors](http://blackhawksupply.com/cdn/shop/collections/GD-Duct_0_32724b59-446e-4602-9845-900ce84cfe70_600x600_1_100x.png?v=1525902491)
![Image for Current Sensors](http://blackhawksupply.com/cdn/shop/collections/CT-300_med_600x600_1_100x.png?v=1525965815)
![Image for Gas Sensors](http://blackhawksupply.com/cdn/shop/collections/Q5_9fe508f4-06ee-4376-a0d8-01f3ceed962f_600x600_1_100x.png?v=1656495283)
![Image for Outside Temperature Sensors](http://blackhawksupply.com/cdn/shop/collections/Outdoor-Air_4_6698b7d4-c74d-4d79-afe1-f2a778fd88f7_600x600_1_100x.png?v=1525902585)
![Image for Outside Humidity Sensors](http://blackhawksupply.com/cdn/shop/collections/Outdoor-AIr_14_73e889d9-72c0-49a8-b7aa-3244a6177a9a_600x600_1_100x.png?v=1525965672)
![Image for Duct Humidity Sensors](http://blackhawksupply.com/cdn/shop/collections/RH_20TT_20Duct_NEMA_204X_0_5bf3c77c-eba9-4c1b-9243-8a07e6d427b1_600x600_1_100x.png?v=1525965556)
![Image for Room Humidity Sensors](http://blackhawksupply.com/cdn/shop/collections/RH_20Resistive_20Room2_20Setpoint_20Override_1_8d939914-25aa-40e1-ae24-7d3557ddb1ff_600x600_1_100x.png?v=1525965135)
![Image for Room Temperature Sensors](http://blackhawksupply.com/cdn/shop/collections/Infinity_20Override_0_ef3262ed-6393-48a3-bd91-8aa200bed9fc_600x600_1_100x.png?v=1655986720)
![Image for Freezer Sensors](http://blackhawksupply.com/cdn/shop/collections/Freezer_6_1200x1200_2b2bcc68-4da6-4bdd-a0ec-3bcc379060c1_100x.png?v=1612451690)
![Image for Strap Sensors](http://blackhawksupply.com/cdn/shop/collections/GD-Strap_9_400x400_57c7c3ea-2a95-4273-b5f6-e4645a3b86e7_100x.png?v=1612451756)
![Image for Light/LUX Sensors](http://blackhawksupply.com/cdn/shop/collections/Light_20Level_0_1af9652e-abdf-4a24-b6e3-4f3023e7e2bf_600x600_1_100x.png?v=1525966099)
![Image for Bullet Sensors](http://blackhawksupply.com/cdn/shop/collections/Bullet-Probe_30_1200x1200_86df93e4-8206-4132-8f13-7c6b3a84d750_100x.png?v=1612451633)
![Image for Level Transmitters for Sale](http://blackhawksupply.com/cdn/shop/collections/SBLT2_1000x1000_400x400_a5387011-1079-43bf-b2f3-3a5019293bf3_100x.gif?v=1633682812)
![Image for Heating Sensors](http://blackhawksupply.com/cdn/shop/files/584547_c3a0c04d-c8d7-4f89-8aee-6a4a15facc9c_100x.jpg?v=1717076667)
![Image for Air Quality](http://blackhawksupply.com/cdn/shop/products/AQ2D_41c1db17-cc87-40e5-b1e1-debc524a3590_100x.png?v=1708973964)
![Image for Facility Monitoring](http://blackhawksupply.com/cdn/shop/products/wingrxtbanner_100x.jpg?v=1710256868)
![Image for Plumbing Sensors](http://blackhawksupply.com/cdn/shop/files/974891_9cf81fe0-49ad-44b1-bf09-c68f8ad31017_100x.jpg?v=1717079750)
![Image for Water Leak Detection](http://blackhawksupply.com/cdn/shop/collections/WD_PIC_1200x1200_ff2b53d6-6d0b-4a7c-9a53-05c5ea36409c_100x.jpg?v=1633683366)
![Image for Accessories](http://blackhawksupply.com/cdn/shop/collections/PIC_GL_A-22AP-A01...04_4C-product_retina_400x400_14114f37-ee0a-436c-99cd-84781d10eec7_100x.jpg?v=1611673512)
View Details
![Veris H735 Current Switch/Relay Combo | Solid Core | SPST | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H735_medium.jpg?v=1706643284)
H735 | Current Switch / Relay Combo | Solid Core | SPST | Veris
Brand: Veris
SKU: H735
View Details
![Veris H938 Current Switch/Relay Combo | Split Core | Adj. | SPST | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/H938_41805154-3599-4180-87ce-111704660c0b_medium.jpg?v=1711573708)
H938 | Current Switch / Relay Combo | Split Core | Adj. | SPST | Veris
Brand: Veris
SKU: H938
View Details
![Veris H120 Enclosed Relay | Current Switch 20A | Fixed | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H120_5e9e1a95-2264-4137-b25a-dab3748e7c47_medium.jpg?v=1689243589)
H120 | Enclosed Relay | Current Switch 20A | Fixed | Veris
Brand: Veris
SKU: H120
View Details
![Veris H930 Current Switch/Relay Combo | Split Core | Fxd | SPST | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H930_2a338eac-1eb8-4249-b2fe-0e21fce9bf73_medium.jpg?v=1689243568)
H930 | Current Switch / Relay Combo | Split Core | Fxd | SPST | Veris
Brand: Veris
SKU: H930
View Details
![Veris H934 Current Switch/Relay Combo | Split Core | SPST | VFD | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H934_medium.jpg?v=1706643280)
H934 | Current Switch / Relay Combo | Split Core | SPST | VFD | Veris
Brand: Veris
SKU: H934
View Details
![Veris H948 Current Switch/Relay Combo | Split Core | Adj. | SPDT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/H948_medium.jpg?v=1713458805)
H948 | Current Switch / Relay Combo | Split Core | Adj. | SPDT | Veris
Brand: Veris
SKU: H948
View Details
![Veris H931 Current Sensor 4-20mA/Relay Combo | Split Core | SPST | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/H931_medium.jpg?v=1714012330)
H931 | Current Sensor 4-20mA / Relay Combo | Split Core | SPST | Veris
Brand: Veris
SKU: H931
View Details
![Veris H738 Current Switch/Relay Combo | Solid Core | SPST | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H738_6c831a2d-4f9f-435f-93bc-8c20545a0c41_medium.jpg?v=1706643284)
H738 | Current Switch / Relay Combo | Solid Core | SPST | Veris
Brand: Veris
SKU: H738
View Details
![Veris H730 Current Switch/Relay Combo | Solid Core | SPST | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H730_fe68bb42-0151-4205-81db-cc3e65adb146_medium.jpg?v=1689243576)
H730 | Current Switch / Relay Combo | Solid Core | SPST | Veris
Brand: Veris
SKU: H730
View Details
![Veris H748 Current Switch/Relay Combo | Solid Core | SPDT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H748_medium.jpg?v=1689243576)
H748 | Current Switch / Relay Combo | Solid Core | SPDT | Veris
Brand: Veris
SKU: H748
View Details
![Veris H940 Current Switch/Relay Combo | Split Core | fixed | SPDT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H940_medium.jpg?v=1689243576)
H940 | Current Switch / Relay Combo | Split Core | fixed | SPDT | Veris
Brand: Veris
SKU: H940
View Details
![Veris H939 Current Switch/Relay Combo | Split Core | Adj. | SPST | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H939_943cba47-c4fc-4193-b905-4c30cb51adb7_medium.jpg?v=1689083959)
H939 | Current Switch / Relay Combo | Split Core | Adj. | SPST | Veris
Brand: Veris
SKU: H939
View Details
![Veris H120NC Enclosed Relay | Current Switch 20A | NC | Fixed | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H120NC_medium.jpg?v=1689243585)
H120NC | Enclosed Relay | Current Switch 20A | NC | Fixed | Veris
Brand: Veris
SKU: H120NC
View Details
![Veris H932 Current Sensor 0-5VDC/Relay Combo | Split Core | SPST | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H932_76bcb315-aec8-4ca3-9e15-99726e8c3488_medium.jpg?v=1689083975)
H932 | Current Sensor 0-5VDC / Relay Combo | Split Core | SPST | Veris
Brand: Veris
SKU: H932
View Details
![Veris H740 Current Switch/Relay Combo | Solid Core | SPDT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/H740_medium.jpg?v=1712258627)
H740 | Current Switch / Relay Combo | Solid Core | SPDT | Veris
Brand: Veris
SKU: H740
View Details
![Veris H949 Current Switch/Relay Combo | Split Core | Adj. | SPDT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H949_07074b2a-7195-401a-a2fd-8cece3e70042_medium.jpg?v=1689083993)
H949 | Current Switch / Relay Combo | Split Core | Adj. | SPDT | Veris
Brand: Veris
SKU: H949
View Details
![Veris H739 Current Switch/Relay Combo | Solid Core | SPST | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H739_medium.jpg?v=1689083959)
H739 | Current Switch / Relay Combo | Solid Core | SPST | Veris
Brand: Veris
SKU: H739
View Details
![Veris H749 Current Switch/Relay Combo | Solid Core | SPDT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H749_medium.jpg?v=1689083954)
H749 | Current Switch / Relay Combo | Solid Core | SPDT | Veris
Brand: Veris
SKU: H749
View Details
![Veris H535NS Relay | 20A(r) | Relay Coil:24VAC/DC | Relay Cont:1HP@120VAC | 1.5HP | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/H535NS_medium.jpg?v=1689083944)
H535NS | Relay | 20A(r) | Relay Coil:24VAC / DC | Relay Cont:1HP@120VAC | 1.5HP | Veris
Brand: Veris
SKU: H535NS
Committed to customer satisfaction
as experts in Sensors
Recently Viewed
Popular Products
View all →![ACI TSENSE-LCD CO2/RH/TEMP, LCD, RELAY, BACNT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/aci-tsense_40e64cd0-72ff-423d-9a33-c59d77ba3a53_large.png?v=1718739583)
TSENSE-LCD | CO2/RH/TEMP, LCD, RELAY, BACNT | ACI
Brand: ACI
SKU: TSENSE-LCD![Belimo ZS-100 Weather shield - galvaneal (13" L x 8" W x 6" D). | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/ZS-100_ZS-101_Actuator_Accessory_38d7fd02-b94d-4c4f-a4a8-951e430e21de_large.png?v=1718728701)
ZS-100 | Weather shield - galvaneal (13" L x 8" W x 6" D). | Belimo
Brand: Belimo
SKU: ZS-100![Belimo EFB24-SR Damper Actuator | 270 in-lb | Spg Rtn | 24V | Modulating | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/EFB24-SR-product_retina_large.jpg?v=1714683328)
EFB24-SR | Damper Actuator | 270 in-lb | Spg Rtn | 24V | Modulating | Belimo
Brand: Belimo
SKU: EFB24-SR![Siemens GRD221.1U Damper Actuator | Spring Return | 120 VAC | On/Off | 30 lb-in | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/GRD221.1U_large.jpg?v=1715956747)
GRD221.1U | Damper Actuator | Spring Return | 120 VAC | On/Off | 30 lb-in | Siemens
Brand: Siemens
SKU: GRD221.1U![Veris EP2100S EP | Analog In | 3-15/0-20psi | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/EP2121S_edfe339f-cd49-4263-bfb4-73f12f370c0c_large.jpg?v=1708554831)
EP2100S | EP | Analog In | 3-15/0-20psi | Veris
Brand: Veris
SKU: EP2100S![Siemens QFM3160 Duct RH and Temp Sensor, 2 percent (high) accuracy, RH: 0-10 Vdc, T: 0-10 Vdc | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/products/QFM3160_large.jpg?v=1692723024)
QFM3160 | Duct RH and Temp Sensor, 2 percent (high) accuracy, RH: 0-10 Vdc, T: 0-10 Vdc | Siemens
Brand: Siemens
SKU: QFM3160