National Instruments CB-37F-HVD High-voltage DIN rail screw terminal block

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National Instruments · NI DAQ connectivity

CB-37F-HVD

Name: CB-37F-HVD
Brand: National Instruments

The NI CB-37F-HVD is a horizontal DIN rail terminal block providing 37-pin female D-SUB connectivity to screw terminals. It supports low- and high-voltage connections up to 150 V within its specified installation requirements.

ManufacturerNational Instruments

ModelCB-37F-HVD

Part Number779491-01

Product TypeHigh-voltage DIN rail screw terminal block

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Part number779491-01

Device-side connector37-pin female D-SUB

MountingHorizontal DIN rail

Voltage rating150 V CAT II

Field wiring37 signal screw terminals; 12–30 AWG

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Overview

Product overview

Key product information and technical features.

The CB-37F-HVD provides field-wiring access for supported NI data acquisition devices and C Series I/O modules. Its screw-terminal connections accommodate up to 37 I/O signals using 12–30 AWG wire.

NI lists this accessory among its high-voltage DIN rail connectivity options. Select the device and cable using the relevant NI compatibility guide rather than connector pin count alone.

The CB-37F-HVD provides DIN rail-mounted field-wiring access for supported NI data acquisition devices. Its female D-SUB connector connects through an appropriate cable, while screw terminals accept individual signal wires.

NI documents this accessory for rack-mounted installations involving low- or high-voltage signals. Hazardous-voltage use requires strain-relieved wiring and a suitably rated, UL listed enclosure connected to safety earth; consult the installation guide before wiring.

37-pin female D-SUB connection with screw-terminal field wiring.
Horizontal DIN rail mounting.
UL-recognized terminal block for connections up to 150 V.
Screw-terminal access for up to 37 I/O signals.
Horizontal DIN rail mounting for equipment-cabinet integration.
Accepts 12–30 AWG field wiring.
UL recognized terminal block for connections up to 150 V.

Verified specifications

Technical data

Verified product specifications.

Signal screw terminals	37
Terminal wire size	12–30 AWG
Maximum current per conductor	2 A
Maximum channel-to-ground voltage	150; includes signal plus common-mode voltage V
Dimensions	13.75 × 9.0 × 6.5 cm
Weight	210 g
Operating temperature	0–50 °C
Signal terminals	37
Maximum current	2 per conductor A
Mounting	Horizontal DIN rail

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National Instruments

Manufacturer

37-pin D-SUB connectivity

Device-to-accessory interface

CB-37F-HVD

DIN rail field-wiring terminal block

High-voltage installation

Hazardous-voltage use requires strain relief and a suitably rated, UL-listed enclosure connected to safety earth. Follow NI cable-keying requirements for high-voltage PCI/PXI devices.

Verify device, cable and installation requirements before connecting signals; the terminal-block rating does not establish the connected device's rating.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI DAQ Multifunction I/O Accessory GuideTechnical resource

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NI 6520/6521 User GuideTechnical resource

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NI DAQ Multifunction I/O Cable and Accessory GuideTechnical resource

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Is the CB-37F-HVD a data acquisition module?

No. It is a screw terminal connectivity accessory for supported NI equipment, not the acquisition device itself.

What terminal tightening torque does NI specify?

NI specifies 0.3 N·m for the screw terminals and a maximum wire stripping length of 4.0 mm.

Is its ground terminal a safety-ground connection?

No. NI identifies that terminal as a shielding connection, not a safety ground.

What is the NI part number for the CB-37F-HVD?

NI identifies the CB-37F-HVD as part number 779491-01.

Can the CB-37F-HVD be used with the PCI-6521 and PXI-6521?

Yes. NI lists it with SH37F-37M shielded cables in 1 m or 2 m lengths for both devices. The NI 6521 requires special keyed cables and accessories; follow the 37-Pin High-Voltage Accessory Safety Kit instructions.

Is a matching 37-pin connector enough to establish compatibility?

No. Use NI's device-specific cable and accessory guidance to verify the connection. For UL listed high-voltage PCI or PXI devices, the installation guide also requires cable keying using the 37-Pin High-Voltage Accessory Safety Kit.