DL-30 series current relayDetailed product description：

1 Purpose
The DL-30 series current relay is used as a starting element in overload and short-circuit protection circuits of motors, transformers, and transmission lines.

2 Structure and principle:
2.1 The relay is an electromagnetic type with instantaneous action. The magnetic system has two coils, and the coil heads are connected to the base terminals. Users can connect the coils in series or parallel as needed, which can double the setting of the relay.
2.2 The scale value and rated value of the relay nameplate. For current relays, the coil is connected in series (in amperes), and the pointer on the dial is rotated to change the reaction torque of the balance spring, thereby changing the action value of the relay.
2.3 Relay action: When the current rises to or exceeds the set value, the relay will act, closing the dynamic contact and disconnecting the dynamic contact. When the current drops to 0.8 times the set value, the relay returns, the dynamic contact opens, and the dynamic contact closes.
2.4 Relays have three structures: AllK, AllH, and A11Q, as shown inAppendix II.
The internal wiring diagram of the 2.5 relay is shown in Figure 1.
2.6 Weight of relay: approximately 0.6kg.

DL-31

DL-32

DL-33

DL-34

Figure 1 Internal wiring diagram of DL-30 series current relay (back view)

3 DL-30 series current relay technical data
3.1 The number of contacts is shown in Table 1.

model	Number of contact points
	Dynamic combination	Dynamic interruption
DL-31	one
DL-32	one	one
DL-33	two	one
DL-34	one	two

3.2 Divided by the range of setting values: the action error of each setting value shall not exceed ± 6%, as shown in Table 2.

model	Maximum setting Current (A)	Rated current (A)		Long term allowable current (A)		Current setting Scope (A)	Action current (A)
		Coil series connection	Parallel connection of coils	Coil series connection	Parallel connection of coils		Coil series connection	Parallel connection of coils
<	zero point zero zero six four					Only a small scale	zero point zero zero three two	zero point zero zero six four
<	zero point zero one	zero point zero two	zero point zero four	zero point zero two	zero point zero four	0.0025～0.01	0.0025～0.005	0.005～0.01
<	zero point zero five	zero point zero eight	zero point one six	zero point zero eight	zero point one six	0.0125～0.05	0.0125～0.025	0．025～0．05
DL-31	zero point two	zero point three	zero point six	zero point three	zero point six	0.05～0.2	0.05～0.1	0.1～0.2
<	zero point six	one	two	l	two	0.15～0.6	0.15～0.3	0.3～0.6
	two	three	six	four	eight	0.5～2	0.5～1	1~2
DL-32	six	six	twelve	six	twelve	1.5～6	1.5～3	3~6
	ten	ten	twenty	ten	twenty	2.5～10	2.5～5	5~10
DL-33	fifteen	ten	twenty	fifteen	thirty	3.75～15	3.75～7.5	7.5～15
	twenty	ten	twenty	fifteen	thirty	5~20	5~10	10~20
	fifty	fifteen	thirty	twenty	forty	12．5～50	12.5～25	25~50
	one hundred	fifteen	thirty	twenty	forty	25~100	25~50	50~100
DL-34	two hundred	fifteen	thirty	twenty	forty	50~200	50~100	100~200

3.3 The maximum error of relay scale shall not exceed 6%.
3.4 The variation of action values shall not exceed 6%.
For DL-31, 32, 33, and 34 current relays, the return coefficient shall not exceed 0.8, and for maximum set currents of 200A, it shall not exceed 0.7.
3.6 Action time
3.6.1 When the action value is 1.1 times, the action time shall not exceed 0.12s; when the action value is 2 times, the action time shall not exceed 0.04s.
3.7 Overcurrent capability: When the coil is connected in series and rises uniformly from the set value to the maximum current listed in Table 3, the relay should not cause
Vibration caused by non functioning contact points. After five cycles, the relay still meets the requirements of this technical specification.
3.8 Overcurrent: When the setting value is increased by 1.75 times or higher, the dynamic contact of the relay should close without shaking.
When there is no external collision or vibration, and the working current at each setting position of the relay (except for the first point) is 0.6 setting value, its dynamic breaking contact should reliably close the circuit. '
3.10 Under action and return current: The movable system of the relay should not stagnate in the middle position.
3.11 When the relative humidity of the surrounding air is not greater than 85%, the circuit of the relay is insulated from the shell (non-conductive metal part on the shell)
The edge resistance should not be less than 300MF2 when measured with a 500V megohmmeter.
3.12 The insulation of the conductive part of the relay to the shell (non-conductive metal part on the shell) can withstand 50Hz AC voltage and 2kV calendar
A 1-minute experiment.
3.13 Contact breaking capacity: When the voltage is not greater than 250V and the current is not greater than 2A, the breaking power of the contact is at a negative inductance
In a DC circuit with a time constant of no more than 5 × 10-3s, the load is 50W, and in an AC circuit, it is 250VA.
3.14 Power consumption
At the minimum setting value, the power consumed by the coil of the relay shall not exceed the data in Table 4.
When the surrounding medium temperature is+40 ℃, the relay will not have insulation or other electrical components damaged during long-term operation under the long-term allowable current and voltage shown in Table 2 and Table 3, and the temperature rise of the coil will not exceed 60'K.
3.16 Lifespan: The relay has an electrical lifespan of 500 times and a mechanical lifespan of 5000 times.

model		Maximum setting current (A)		Maximum test current (A)
DL-31 DL-32 DL-33 Dl-34		zero point zero zero four nine		zero point zero two five
		zero point zero zero six four		zero point zero three two
		zero point zero one		zero point zero five
		zero point zero five		zero point two five
		zero point two		one
		zero point six		three
		two		ten
		six		thirty
		ten		fifty
		fifteen		seventy-five
		twenty		one hundred
		fifty		two hundred
		one hundred		two hundred
		two hundred		two hundred
series	Maximum setting value		Minimum setting value		Efficiency consumption at minimum setting value (VA)
DL-30	zero point zero zero six four		0.0064 (with only one dot scale)
	zero point zero one		zero point zero zero two five		zero point four
	zero point zero five		zero point zero one two five		zero point four
	zero point two		zero point zero five		zero point five five
	zero point six		zero point one five		zero point five five
	two		zero point five		zero point five five
	six		one point five		zero point five five
	ten		two point five		zero point eight
	fifteen		three point seven five		zero point eight
	twenty		five		zero point eight
	fifty		twelve point five		six
	one hundred		twenty-five		twenty
	two hundred		fifty

4. Use and maintenance
4.1 To use a relay, remove the casing, pull out the machine, and check for any damage that may have occurred during transportation, such as contact between the moving plate and the magnetic plate, contact between the coils of the balance spring, friction on the moving plate shaft, etc. To do so, set the pointer of the relay to the first setting point, manually rotate the movable system towards the magnetic plate direction, and then release it. The movable system should return to its original position until it stops, and then make necessary adjustments and settings.
When readjusting the relay, it must be ensured that:
4.2.1 The axial movement of the movable system is between 0.15 and 0.3mm.
4.2.2 The air gap between the moving piece and the magnetic pole should ensure that the moving piece and the magnetic plate do not collide under any specified working conditions of the relay.
4.2.3 Relays with dynamic contact points and dynamic contact points shall not have bridge shaped contacts simultaneously make contact with dynamic contact points and dynamic contact points during operation.
When the pointer rotates from the first scale value to the final scale value, the coils of the balance spring are not magnetized.
When the relay is activated, the bridge shaped contact should slide on the centerline of the static contact (tolerance ± 1mm), and the total air gap between the dynamic and static contacts should not be less than 2mm.
The distance between the static contact point and the limiting plate should not exceed 0.3mm.
4.2.7 When adjusting the action value of the relay, the adjustment of the minimum setting value mainly changes the magnitude of the spring reaction force, and the adjustment of the maximum setting value mainly changes the air gap between the rotor and the magnetic plate.
4.2.8 Relay shafts and bearings should not be lubricated.
4.2.9 It is not allowed to clean the contacts with sandpaper or other rough materials. It is recommended to use a sharp blade or a clean fine grinding stone to clean the contacts, and then wipe them clean with a clean, soft cloth to avoid touching the contacts with fingers.

5 Ordering Instructions
5.1 Product model and name.
5.2 Maximum setting value (current or voltage).
5.3 Order quantity.